The new random background was chosen because Summer has begun.
The Colosseum equipped with a crosscap, making up a Möbius strip one-loop stringy world sheet diagram. The windows apparently indicate an open-closed holographic duality.
The conference takes place from Monday through Friday:Strings 2008. In fact, it's not clear whether there will be any live broadcast at all.
DJ Yvan: Adagio for Strings 2009
See also a text about Strings 2009 after the conference ended on Saturday.