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The release of WordPress 2.8.2 has been announced. This was a relatively unexpected release, however it fixes a cross site scripting (XSS) vulnerability due to comment author URLs not being fully sanitized. This could then cause you to be directed to another site from your admin panel.
I’ve been reading on Twitter that people haven’t had any problems upgrading, it looks to be a pretty simple fix. Just to be on the safe side, I’d recommend you take a backup before upgrading.