In the interest of getting the word out as quickly and as widely as possible, a brief word about a new WordPress release: If you recently installed version 2.1.1, you should upgrade to WordPress 2.1.2 immediately. There was a security breach on the server which housed the download archives, and some files in the 2.1.1 download were modified to include a serious security hole. There are more details in the official WordPress Dev Blog announcement.
While technically this only affects those who downloaded the 2.1.1 .zip or .tar.gz archives from the wordpress.org site in about the last week, it certainly wouldn’t hurt to go ahead and upgrade, even if you downloaded earlier, or installed from SVN. Just because (there are a couple of unrelated bugfixes in there, after all).