The fame of the symfony project was a great appeal to spammers, especially since we provided a wiki and a bug tracker open to anonymous contributions.
Lately, all the pages of the wiki got methodically spammed and an average of 5 spam tickets were created every day. Unfortunately, the anti-spam protection of the trac software isn't mature and secure enough to be used. Besides, we all know that it's just a matter of time before a spam protection gets cracked.
So the inevitable happened today: The anonymous contributions to the wiki and bug trackers are now closed. All contributions require a trac account, which we provide to anyone requesting it by email at webmaster at symfony project dot com. You can suggest a login and a password in your email.
We hope it won't reduce the amount of public contributions to symfony, but we couldn't possibly keep on cleaning the trac everyday like that. Our apologies for the inconvenience, and welcome to all the new trac users.