omgmachines.com

I love how the Microsite Masters interface is easy to use and navigate. I track 25,000 keywords with them and I'm fortunate that they don't count duplicate keywords as I'd be way over that considering I track tons of the same keywords. This is because once I find profitable keywords I attack them with multiple websites; and I also run multiple test sites for keyword groups to keep the keyword variable constant. I also love how they track the history of any keyword that is being tracked in MSM...not just of your website but of the top 20 websites for that keyword. This is HUGELY beneficial for analyzing, tracking, and figuring out changes going on with the search engines.