I just came across the blog of the bass player from Mute Math and it's awesome...he gives the best free lessons that I have seen on the internet period. He's also a badass bassist... http://roymitchellcardenas.blogspot.com If you haven't heard Mute Math yet, check them out!
That seems like a sick site, but something odd is happening to me. When i go on that site, every 20 seconds or so it will redirect me to a search page because it couldnt find a text file...its weird. Which is too bad cuz im a bass brother myself and could use some thoery refreshment.
I also had some issues with the site not loading properly. There is A LOT of info, so it takes a while to load. This guy is one badass player...his bass definately sits back in the music but it is very intricate and well done!