Another Quick Update
Looks like Wordpress released another small update today, bumping up the version number to 1.5.1.3. This one seems to deal with security issues, much like 1.5.1.2 did. Then again, that “update” was really just editing like 3 lines of code in one file (and this one doesn’t sound much different).
And here’s the Codex instructions for going from 1.5.1.2 to 1.5.1.3.