You have probably already noticed this in the WordPress dashboard but WordPress 2.8.1 was released a couple of days ago.
WordPress 2.8.1 fixes a number of bugs and corrects some security problems with the plugin administration pages.
If you have already upgraded to 2.8, I highly recommend that you upgrade to 2.8.1 as soon as you can. If you are still running 2.7.1, you should upgrade, but it doesn’t need to happen right away.