First came across it a couple of years ago, when looking at various options for an all-in-one personal/family history/tech tips (mainly MS Office/Word) site, preferably with some sort of blog/wiki capability. Looked at the mainstream open source blog platforms, CMSs and a couple of wikis. The main problem I have with a lot of these things is working out what they "really do" and how to fit the bits together. I liked Wagn's card idiom - it's certainly a close fit for some of the simple tech. documentation I would like to do. I also suspect that it could be adapted for genealogy purposes, but that would probably require more skills in Ruby/HTML/CSS than I currently have. Hosting is a big problem, so eventually I went for the "free" cloudstore option. Not much progress at all yet, but laying some groundwork now.