Learn Linux for Free
The Linux Foundation (the people that employ Linus Torvalds) today announced new free training sessions for Linux. The sessions that they've listed as free at this point are on some basic topics like Linux performance tuning and troubleshooting.
Then there are a few more developer focused topics like how to contribute to Linux and how to use Git. No this isn't quite Linux for dummies, but hey it's free.
Considering the current economy, free is always a good thing right?
Then again, Linux education, at a basic level has always been free -- that's how I learned. Any Linux user - and i don't care which distro you use - has a built in learning mechanism that no other OS can match. It's called the 'man' command and though it's not perfect, it's a decent start.