I hate it when I buy a piece of hardware and find that it's not supported in Linux. Why don't I have the freedom to choose the operating system of my choice?
Some companies have problems with opening up their drivers. Fine. At least do what nVidia does, provide closed, binary drivers. (Thank you nVidia, at least you provide them, and they work!).
Flash on Linux has always been a problem. It runs slow, jittery and is practically unusable. I tried to find out if other users were facing this problem, and sure enough, many are. The solution posted on (this thread) was to downgrade to a previous release of Flash. I had to download a 73MB archive containing a number of previous releases from Adobe's website. Adobe doesn't seem to care much about Linux users. Even the downgraded version has issues, but at least its somewhat usable.
I'm in a good mind to write to every company I come across that doesn't provide Linux support. About time Linux users made themselves heard. There are already a number of petitions.