FWIW, PR1.2's MicroB has been very subpar for me. Uses way too much CPU (this is the killer, the phone runs ridiculously hot with the browser open) and implodes when I have the audacity to open 4 or 5 seperate tabs.

Other than that, I've had few issues with it.

re: fitting linux into 256 MB being impossible, that's clearly nonsense. Ever heard of Damn Small Linux?