Looks like WordPress had a breach in their security and someone was able to add some exploit code to some downloads of the 2.1.1 release. Not all downloads were affected, but WordPress has released 2.1.2 to help eliminate any issues. My host had just recently upgraded their on-click installs to 2.1.1 – looks like another time procrastination paid off as I had not updated yet! You can read about the issue here.
WordPress 2.1.1 Issues