I have always been a fan of the folks at Idealware.org.

They consistently produce high quality reports that are very helpful when trying to make sense of the overwhelming number of technologies that non-profits and associations use.

In there most recent newsletter, they included a simple overview of "Comparing Options for Collaboration Software".  It's this type of report that is perfect to share with volunteer leaders of associations to help educate them to the various options that exist.

Idealware... keep up the good work!

Brett