Late last week, Apple released Java updates that would remove the Flashback malware that seems to be making the rounds. Since then, Apple has released the standalone Flashback malware removal tool from Lion instillations lacking Java.
The Java hole that Apple just patched is by far the most dangerous method of attack, but other methods such as tricking the user into installing the software have been used. By default, Java no longer comes preinstalled on Macs running Lion, so this tool removes the malware in instances not involving Java. This update is a whopping 356KB in size, requires Lion without Java, and can be obtained via Software Update, or directly from this link.
On a less ominous note, Apple has also seeded a new build (11E46), to developers over the weekend. This build reportedly has no known issues, but asks developers to focus their attention in the areas of Mail, QuickTime, the App Store, Screen Sharing, and Time Machine.
Apple seems to be turning over updates rather quickly since the release of Lion last July, so I would expect this update to be released in the near future. Besides, Mountain Lion will be here before you know it.