On the scanner, the software is now provided by Apple for many scanners and is accessed via the printer control panel or the application Image Capture. Works pretty well. But it takes some time to find it and get used to it.
Apple recently announced an upgrade for the Apple TV which I bet is to address this very situation.
Each time you upgrade an OS, you WILL have these issues. It is part of reality. Even updates need to be approached with some caution. I never update until I watch to see if some unintended problems have been caused. This occurs whether you are running OSX, Vista, XP or Linux.
The iTunes/ Snow Leopard fiasco was unforgivable to me. Apple creates the hardware AND the software and couldn't test enough to make sure that both worked together. As it was, the hardware we had bought was temporarily unusable. I don't put up with that crap from Microsoft.
It will happen again, so I've decided its time to consider another platform for my video files.