I've been looking at open source software lately, and I like what I'm looking at. I haven't migrated to Linux yet, but I'm replacing many of the expensive brand names with better OS software. GIMP isn't instinctive, but neither is Photoshop.
Open Office is much better than the built-in boobytraps of MS Office, and I'm in love with Google Docs - not for all purposes, but great for collaboration and easy transfers while traveling.
So now I'm looking at content management systems and thinking of wikis as documents and teaching platforms as well as "wikipedia" clones. Maybe just starting as a supplement to Blackboard, since I get paid to use that, but also as an alternative for people who are having issues with firewalls. That seems to happen once a year, at least!
I'll let you know what the results are, let me know your favorites.