Want to learn more about playing Bass? Have you seen Wheat's BassBook? It's a great free resource on the Web. It has heaps of technical info about music theory, Chord Progressions, Scales etc, a sort of bass-playing encyclopedia - take a look:

Wheat's BassBook
http://comp.uark.edu/~jemartin/bassbook/

Other resources for bassists:

Bass Lessons
http://www.guitarsite.com/HowToPlay/bass-lessons/

Bass Space
http://www.guitarsite.com/database/Tablature/rec/890/
News, links, tab, sights, sounds and lessons for the bass guitar

Jam Bass
http://www.guitarsite.com/database/Guitars/rec/2493/
Play bass with your thumb on the back of the guitar neck. The Jam Bass is a wafer-thin panel that easily mounts on the back of any guitar neck by means of a self-adhesive strip. Played by the thumb, it duplicates the bass guitar E- and A-string notes fret-by-fret. A miniature circuit pack contains a multi-voiced polyphonic synthesizer which generates audio and MIDI outputs.

Bass @ Harmony Central
http://www.harmony-central.com/Bass/
Bass Instruction, Tablature, Effects, FAQ, Software, Newsgroups, Classified Ads, Magazines, Manufacturers, Other Bass Sites

Vintage Bass
http://www.vintagebass.com/
The entire focus of VB is based upon Steve's personal passion and appreciation of the bass rather than a "profit motive". Many items are sold at cost but only to those who are as truly appreciative of these great basses. VB maintains an extensive archive of vintage bass data and can answer many questions you may have with regard to instrument identification, dating, value, specific instrument/parts locating.

Bass Frontiers Magazine
http://www.bassfrontiers.com/
In every issue, Bass Frontiers publishes more than a dozen new products, CD's, book and video reviews, entertaining articles and stories by a wide variety of industry professionals, and always loads of lessons and features.