I like Dark Schneider and TheLegendaryRob myself, their posts are always worth a read.
However, there are some like Ferrell (multiple HDD genius) and BenJeremy (a technical wiz), who don't post often, but when they do... look out, they've got something good or interesting.
I mostly, though, like the entire community (and I've said that more than once). Everyone, even GTac01 (wacky posts and all), have something interesting to say.
I must say that "hacking" the Xbox and discussing things in these forums has been more fun than actually playing Xbox games (xcluding HALO, of course)!
...damn, I'm getting all teary eyed...