No problem! I could talk for hours about mix networks. If you enjoy that paper, there's a few follow-up papers they wrote that examine some possible threat vectors and possible solutions. All in all, it's a very interesting system.
If you're ever looking for more reading on the subject, I'd recommend all of the starred papers on Free Haven [1]
Oh I love that site. Periodically skim it for interesting reads. Btw, is there a way to contact you or a place you usually frequent if I do get involved in a mix project? My limited resources and memory troubles make it unlikely. However, if I or someone I meet is into it then it would help to have someone that can bring people up to speed on the subject.
If you're ever looking for more reading on the subject, I'd recommend all of the starred papers on Free Haven [1]
[1] http://freehaven.net/anonbib/date.html