Jailbreaking does unlock a lot of functionality that should be in a PC. Being able to SSH into the system and use unix tools opens a lot of possibilities. Just being able to rsync music over wifi to my iPod and scrapping iTunes is worth it.

Apple's underlying Darwin system works great on a mobile device. I don't own an Android, but afaik it's underlying Linux system is not as robust as Darwin. So where else do you go for a Linux/Unix based smartphone/tablet?

Where are the Linux tablets, and where is the support from the Linux community for such hardware?