First impressions are that it is really clean and simple to use. I agree with others that you should have a facebook login as well as twitter. One minor thing I

First impressions are that it is really clean and simple to use. I agree with others that you should have a facebook login as well as twitter. One minor thing I noticed is that if you do a search the conference results aren't in date order. For example, if you search for "Berlin" the date order goes 2010, 2007, 2010 which, IMO, is a bit counter intuitive. Apart from that, all good so far.