As my username suggests, I am a total Linux noob who just got a Raspberry Pi Model B because... why not? It was US$52 with a USB power adapter, tax and shipping. I bought it from Newark, a US distributor, and while the website said it could take "up to three weeks" to arrive, it showed up on my doorstep in two days. Yay!
I bought a 16GB Class 10 SD card because I figured if this experiment went badly, I could still use the SD card in my camera. Got everything set up in a few hours. The hardest part was calibrating the video output to fit on my 720p LCD TV. I had configured it to boot into the GUI, which made it hard to figure out how to edit the config.txt file because I could barely see any of the icons. I just saw the big raspberry in the middle But the instructions on this site and on http://elinux.org/RPi_Beginners made it reasonably easy for someone who hadn't done anything with a CLI since MS-DOS 3.3 to figure out.
My first project will probably be installing XBMC on it. After that, who knows? I'm looking forward to tinkering with this little gem of a computer and finding out what other people are doing with it.