Directory of conferences

I guess that http://lanyrd.com/ may be of interest to some of you. Basically, Lanyrd is a directory of conferences, events and speakers. Hence, you can find valuable information there. However, the site promotes itself as a “social conference directory”, since it depends on the internet community¬†to update information about conferences. Users can¬†sign in with Twitter to submit new conferences/events or add talks that they have given.