Check out this article from Chief Learning Officer magazine from Brandon Hall Research featuring five systems that do just that:
http://www.clomedia.com/columnists/2010/July/2986/index.php
BTW, if you’re not subscribing to CLO, maybe you should… it’s free and though the focus is on corporate learning executives, there’s a lot here that can keep you ahead of the game in the non-profit education sector.
Happy reading!