Apple has dropped two new updates that you'll see in Software Update right now (if indeed you have the specific components they're designed to update). iDVD is first -- it's now upgraded to version 7.1.1, and the upgrade improves overall stability, as well as compatibility when bringing in slideshows directly from iPhoto.
And the MacBook Air has nabbed a (very) Late 2010 Software Update, which supposedly fixes some issues with the system going to sleep. I'm not 100% sure this MacBook Air update is new (not only is it listed as a "late 2010" update, but I don't have an Air to check on, and everyone on staff who does is currently
