Here is my links page, where I have picked my favorite sites for your viewing pleasure.  I assure you that all of them are infinitely better than my own, so you should go and see.  I have also included comments of them, so you know what you may be looking at. 
Planet Namek- One of my personal favorite dragonball sites.  It's even updated on a regular basis.  It has info on the various planets, systems, and moons in the series (very odd and cool).  Good layout, good image gallery, all around great site.
The Fate of Vegeta-Very odd site with lots of fanfic type stories about the Saiya-jin prince.  Nice layout, very weird stuff. 
The Madhouse-I stumbled on this site through Blue Wind of Hope (who I would link if there was any updating planned pretty much ever).  Celine I think is the webmaster's name and her fanart is absolutely AMAZING.  My favorite site just for that reason.
Pojo.com dragonball page-updated almost every day, knows everything before most sites do.  A very odd DB theory page, but it IS ingenious.   Also has an episode guide in case you miss one...but I would never need that.  Lastly, it has a "who'd play who" section, and I whole-heartedly disagree with most of their picks, especially Trunks. 
What can I say?  I just LOVE Yajirobe**
Wrong Way has polls, Multimedia, tons of stuff for the DB buff to have fun with.  Oh yeah, and it's run by boys.