the removal of OS X Lion from the Mac App Store. While this isn't too big a surprise, it could leave some owners of older Macs stuck if their Mac isn't supported by OS X Mountain Lion but were supported by OS X Lion.
That is a very nasty, environmentally unfriendly, non-green move by Apple. They need to fully support older computers back 20 years. To stop supporting computers that are only a few years old (e.g., can't run MtnLion but could run Lion) is horribly wasteful of resources.
Remember:
Use
Reuse
Recycle
It is far better to REUSE rather than recycle. Older computers can be passed down or sold to others who can't afford the latest and greatest.
Bad Apple at the core.