I would advise against the 'less-rails-bootstrap', 'compass-bootstrap' gems and whatnot (there's a whole bunch of them).

I tried a few of them before resorting to embedding bootstrap as plain less.

The gems did either not work at all for me or did not support 2.0-wip, and none had a clear upgrade-path (the sass-compiler chokes on 2.0).

Generally I've become strongly biased against the practice of bundling CSS/JS-libraries as gems. It never seems to work quite right (only jquery ever went smoothly for me) and they always seem to introduce an ungodly amount of magic. - When all you really want is drop a few static files into vendor/assets...