Harold: Awesome analysis. I disagree with you only in your "angels on the head of a pin" analogy. Having a learning professional explain exactly how Elgg works and doesn't fall under Blackboard's patents is very important. No attorney would ever look at Elgg or any other learning system and understand it to the depth necessary. (That's probably why the patent got approved in the first place.) Hopefully every attorney who ends up defending Elgg, Moodle, Sakai, Desire2Learn, etc. will have this post as a reference. To that end, I'm going to set a link and trackback from my blogs and reccommend everyone else do the same to make sure that this post comes up high in an attorney's google search.