I did a presentation entitled Unusual Web Bugs at 24c3 a few weeks ago, for which you can find slides and video for on the first link.
However, since some of the things I presented were some of my own research which I haven't posted anywhere, I'll write a couple of posts about that in the next couple of days. There isn't too much though, so there's no need to get your hopes up, and if you've seen the video, you already know it.
[EDIT]P.S. Any comments or criticisms about the presentation would be greatly appreciated[/EDIT]