This is really interesting. I've been trying to come up with something similar for use in forums but it's really aggravating as everyone insists on using a different format to store everything. I miss usenet :-(
Don't they all have news feeds these days?
Most of them, but it's not the same - that usually lists top posts only. I'm interested in the thread structure of all the comments and such. It's doable, just a pain in the ass.