Apple just released a new software update for its popular iPhoto app today. iPhoto 9.4.3 contains bug fixes, along with some new features for Photo Stream, like the ability to delete photos by dragging to Trash, and exporting Photo Stream photos through the File Menu.
There was another update released for Aperture as well. The Aperture 3.4.4 update also has some improved Photo Stream features, along with several bug fixes.
Here are the full notes for both iPhoto and Aperture: