The first to be updated is iPhoto, which now supports Mountain Lion, and now includes sharing options such as Messages and Twitter, alongside this they have also conducted the usual performance and stability improvements.
the next on the list is iMovie, which has had manly bug fix’s which include:
– Fixes an issue related to third-party QuickTime components that could cause iMovie to quit unexpectedly
– Resolves stability issues when previewing MPEG-2 video clips in the Camera Import window
– Fixes an issue where audio was not included when importing MPEG-2 video clips from a camera
Aperture has also had an update, but again only a bug fix that will fix an issue that in rare cases could cause Aperture to hang or quit unexpectedly when upgrading libraries
There’s not much else to say that I’m afraid, you can update all of the apps for free from the Mac App Store as usual.