If you are using WordPress you urgently need to upgrade to version 1.5.1.3 (released last week). This is why. Update: OK, apparently that hole had already been fixed, but there was another vulnerability. You should still upgrade.
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From slashdot:
On Friday there will be some upgrading of the site so commenting will be off for a while, and possibly, comments will be stuck in moderation. That is all thank you very much.
Hear me, Ubuntu-using brothers and sisters! Never use the on-line upgrade option to switch to a newer version of the operating system!
ScienceBlogs is getting some back-end work done this evening, with yet another server/ MT upgrade. This is intended to help with the frequent timeout problems that bloggers and commenters have been having.
Its probably worth pointing out that unlike the upgrade from 1.3 to 1.5 (which took me about three hours), going from 1.5x to 1.5.1.3 really does take about 10 minutes.