Recommend me some ARM tutorials....

I've been using AVR's for a long while, but lately I've seen some pretty powerful looking ARM boards like this one for dirt cheap, and I've got the bug to play with them. So if anyone could point me to some good ARM tutorial-like sites, I'd appreciate it.

Also, I'm guessing that means I should dive into the C language... I've avoided it all these years using assembler or some flavor of basic, but I don't see very many arm basic compilers around. If you also know of any good introduction to C sites, I'd appreciate that as well.

Thanks much !