I recently tried to convert my main work laptop to Ubuntu, I spent a good 2 months using it before going back to Windows 7. My laptop is designed somewhat poorly in that it's heat sinks are in the armrest before the keyboard. One thing I noticed about the Linux version of flash is how CPU hungry it is, simple sites like Youtube, or any site with flash video playback would consume an entire core on my laptop. I spent some time researching why and everything I've seen so far indicates that Adobe has just implemented it poorly on Linux. Some posts indicate its implemented just as poorly on OSX, using WAY more CPU than it does on Windows. So while in Linux not only would my laptop get hot, but it would kill it's battery in a heartbeat. Considering these poor implementations I can understand why Apple has taken the stance it has against flash. Using flash or not isn't a deal breaker when it comes to the web for me, but I found it EXTREMELY annoying under Linux. I think it's actually a good thing that Apple is pushing more for alternatives away from flash.