The REAPER Blog: Dedicated to the BEST DAW in the world!
It's got a ton of little helpful tidbits and crap. Actually, from that page you can get to this:
#REAPER WEEK – 100 tips on using REAPER
Yup, 100 tips for Reaper. Most of those are pretty awesome!
Also off of that, I found that Sound On Sound has their own little area dedicated to Reaper.
Check dat shit!
I'm never going to leave Reaper again
(I went to Cubase for a short time last month. The switch really messed up my workflow)
Nothing against other DAWs, but Reaper is definitely the easiest to use and most well-supported that I've ever used. Their community is fucking awesome - I ask some pretty oddball questions and almost always get a response with an answer in a day or two.