So I could probably learn just about any song I wanted, given enough time. But I'm also really interested in learning the basic structures and habits so that I can more easily pick up other songs, play with others and to improvise.
That said, I really like the theory and philosophy behind this site StudyBass.com:
StudyBass is for bass creators—bassists who want to use the bass in a creative, original way.
Anyone can learn to play other peoples' basslines and bass solos. Does learning to recite a poem make you a poet? No! And, that's where StudyBass is different...
The goal of StudyBass is to educate you on how music works and how to create your own basslines and solos, not just to parrot those of others.
The site is really useful in that it has not only a ton of written, audio and video material to follow and learn from, but a number of useful audio tools including a tuner, a metronome and scale reference sheets.