Skype as a Guest includes voice and video calling, group instant messaging and screen and file sharing features for up to 300 people per conversation. Users will be given a unique link to share with contacts that instantly open the Skype conversation, which can be made up of more Guests, or fully signed-in Skype users.

So, what's the catch? Not much: conversations expire after 24 hours, and you'll still need to log-in to call a landline or use Skype's live translation features. The account-free mode also only works in Skype.com's web-client, but those limitations aside it seems to offer all the service's basic free features. Not bad -- particularly if you only use Skype when somebody else asks you to.