So, you don't mind being followed and tracked? You don't care if your friends can see what websites you've been to lately, what software you've been running, or even what music you've been listening to? Then you'll love the web's trend towards extreme openness: sharing everything you do on your computer. Sometimes referred to as sharing your 'attention' data, this is a growing market. Below, we round up 12 services that want to track your every move - voluntarily.

Wakoopa is an excellent service which tracks what software you have been running. It keeps tabs of what software is running in the background, what software you have installed, and what software you actively use. Every so often the software uploads this data to the Wakoopa site where it then lists all programs you have been running. The interesting thing here is that you can add friends to track individually or join a team and combine the data. Thanks to Wakoopa, I have found several useful programs that I now use regularly.

Last.fm has been making news with the site being acquired by CBS for nearly $300 million. If you're a tech-savvy music fan, you probably already use it. With Last.fm you download a small program which gathers information on the current song you are playing through your favorite mp3 software application. Through a process called "scrobbling," the software determines what song you are listening to and then uploads this song’s data to the server and then keeps track of it. On the website itself there are many ways of viewing the data which is fun to play around with. To be honest though, I think the greatest part is learning exactly how much horrible music you listen to and what songs your friends listen to in comparison. (Our Last.fm review.)

Cluztr takes it to the web by tracking every site you visit online through your browser. Not only that, it also keeps a history log or "clickstream" of all those sites. One word of advice, avoid visiting sites that your mother would not think much of, as it’s all out there for your friends to view. Cluztr installs a plug-in to your FireFox or Flock browser (sorry IE and Safari users, Cluztr is hopeful for a mid to late 2007 release) where it then captures your entire web surfing history and compiles it into your “clickstream” which you are free to share or publish on the web for all your friends to see. There are also social functions built into the sidebar which allow for posting of messages for that specific site which other users can see when visiting that same site. (Our Cluztr review.)

AttentionTrust offers services similar to Cluztr. AttentionTrust installs as a browser plug-in and tracks the sites you visit. You can then take this data and share it with other applications or development projects that could make use of this data, or simply store it on your desktop. AttentionTrust's idea is to let you share this data with in interested parties for a fee - in other words, a form of lead generation.

Atten.TV is another site that allows you to follow what you or your friends are clicking on around the web. You have the option to share this data or keep it private. It is completely up to you. Since you are reading this article, I think it is safe to assume you are leaning towards the former option. The downloadable application is only for Mac OS currently. (Our Atten.tv review.)

Me.dium can be considered a competitor to Cluztr. Me.dium takes the same basic approach, but doesn't act as a personal log: instead, it lets you see which sites your friends are on, and join them there. It is simply personal preference on your decision to use Cluztr, Me.dium, Atten.TV or AttentionTrust. (Our Me.dium review.)

Plazes is a service that tracks where you are no matter where you are in the world. So now if you not only want your pals to know where you are online, you can have them know where you are in person. Just be sure not to get in to trouble with this service.

iStalkr doesn’t keep tabs on you directly, but rather, indirectly by utilizing RSS and ATOM feeds that most social web 2.0 sites are utilizing now. If you sign up for an iStalkr account and enter some social sites you are a member of, like Del.icio.us and Twitter, iStalkr will then grab the RSS/ATOM feed for that service and will be able to get your updates from the site. To put it simply, think of iStalkr like as a central hub for your social website information and updates. (Our iStalkr review.)

SlifeShare is an application built for the Mac OS primarily. If you are running Firefox you can install the extension regardless of what OS you run. SlifeShare is similar to iStalkr in that the application tracks data from multiple sources and acts as a central hub, but SlifeShare takes it a step further and collects this data directly. Music, videos, photos, websites, applications, and more are tracked and then the data is displayed on the SlifeShare website which you can share with friends. You are only allowed five friends, after which you must either become a premium user or just stick with the five friend limit. (Our SlifeShare review.)

YouTube Active Share simply allows you to share videos that you watch on YouTube with all your friends. Your profile will show what videos you have recently watched and when you are currently watching a video while others are viewing the same video, they will see your name appear on a list of people currently watching that video.

Particls is a downloadable application which doesn’t necessarily track what you do, but instead tracks what you are most interested in receiving information about. The concept is that you allow the Particls software to search your documents for keywords that will allow the program to determine what information you want to be fed to your computer via RSS and ATOM feeds. For example, if you type in Web 2.0, it’s almost a guarantee you will receive site updates from the Mashable website directly to the Particls software. Minor problems with the application is that it can be a resource hog at times, but it is very powerful, and Particls will have an ad supported version and a pay version in the future. (Our Particls review and custom Mashable version.)

Google History has drawn much controversy over privacy issues. Google search history is another controversial tool Google released that tracks every search term you enter into Google’s various search tools. This feature is mainly for your benefit only.

Got any more sites that track you around the web? Add them in the comments.