In case you missed it, please check out bgtrain.com
This new site is a database of backgammon problems in a quiz format.
You can register a handle and track your progress if you like. I find it quite addictive.
The answers are GNU 3-ply analysis (not ideal but pretty good)
the problems are not carefully selected (there are some forced moves and others that are blindingly obvious).
Nevertheless, I get plenty wrong - more than I care to admit. Having a gimme problem now and then feels good!
I am finding this site quite addictive. A go-getter would catalog his errors into cram.com for further review. Check out Sean Williams article for a how-to explanation ..
Note the site has only been up a week and I expect continual improvements.