My updates (iWork, iPhoto, Aperture, iMovie, remote desktop) after installing ML got borked. I lost my wireless network connection in the middle of the download, or never really had it because the work network authentication got all messed up by installing ML. After fixing the network authentication, I went back to software update (app store) and now the updates didn't show up as available, or even as previously downloaded. The ability to update just disappeared, like it both thought I had them, and so don't need to get them again, and also that I didn't have them yet, and so didn't show up as previously downloaded.
I went to the support page to manually download the updates, which worked fine.
Weird.