I had been checking out the new forum last night (8pm pacific, Califonia) and just came back (4:15 am) and the first thing I did was click the logo at the top left. The page threw about 5 PHP errors at me. At least 2 about buffer errors due to headers already sent and one about errors in the $email class. I don't remember them exactly and it won't do it again.
You should really have errors turned off in PHP.ini and printing to a log.
Also when I tried to reproduce this, now when I click on the logo at the top I get taken to www.arduino.cc
but it would be nice to go to the forums main page.
Thanks for the great work. It's looking really good.