(Long time lurker, only a reader till now) I've been looking for something like matrix for quite some time now (albeit probably in the wrong direction) and it seems like a really cool project. I've been wanting to build a chat application on top of a chat protocol like that for ages! Its a big boost to finally get started. Thanks!

Edit: whoops, I had commented once before, it was just so long ago that I forgot about it!

I really liked it, so I ported it to perl implementing a basic caching system (SHA1), I hope you don't mind: https://github.com/psychotropic/Get--Url/