The problem with android is that it does not use standard linux libraries (e.g. glibc) but uses its own custom libraries instead.

Basically, this means that porting linux applications is next to impossible - you'll have to rewrite from scratch (sucks).

Even their bluetooth stack is reta5rded. AFAIK: You have to download a third-party app to get decent bluetooth support (e.g. use a keyboard and mouse).

You can install chroot version of liniux onto android but does mean installing a custom kernel but I'm not sure how mature this is.

Meego & webOS are the last "full-features" mobile OS surviving today and are probalby our only hope of getting a full-function mobile device.