WordPress 2.8.2 [1] has just been release.
WordPress 2.8.2 fixes an XSS vulnerability. Comment author URLs were not fully sanitized when displayed in the admin. This could be exploited to redirect you away from the admin to another site.
Changelog: WordPress 2.8.2 [2]
Download: WordPress 2.8.2 [3]
Download: Modified files since WordPress 2.8.1 [4]