WordPress 2.1.2 has been released.
There was a security breach on the download servers at wordpress.org and some files were compromised. If you upgraded to version 2.1.1 in the recent days then the patch is a must for you.
I had my WordPress upgraded about 2 weeks which put me in the safe zone but I upgraded anyway as there were a few additional fixes included with the latest release.
Get the latest version at: WordPress.org