The second beta for the upcoming iOS 5.1 update has been seeded to developers. The big change in this update is the ability to delete individual images from Photo Stream.
Currently, when you take a picture on an iOS device, Photo Stream (a feature in iCloud) automatically syncs it with all of your Apple devices. With iOS 5.1 beta 2 onwards, you can manually delete an image on a device running this update and it will automatically get deleted from other iOS devices running this update. Older images, however, will have to be deleted manually from all the devices.
In other news, Apple has also released iTunes 10.5.2 update that brings "several improvements for iTunes Match" and "fixes an audio distortion problem when playing or importing certain CDs".