WordPress 1.5.1.2 security update
In case you haven’t heard yet, there’s a security update for WordPress 1.5 (and 1.5+) users who run the default template. The manual fix is pretty easy if you’re familiar with editing code: just add a line of code to one file.
For users of 1.5.1, you might want to upgrade anyway, especially if you didn’t upgrade to 1.5.1.1 (which fixed some issues with feeds/trackbacks/pingbacks).