so... what do you recommend for me to learn bass theory and harmony?

I've been playing for about 8 months thinking I wouldn't need it, but now I realize it would be a great help. Also my style is extreme metal.

So... any good books or DVD's people can recommend?
My Rig:
Yamaha RBX 375 bass
Peavey Millenium BXP bass (won at Summer Slaughter 2010, signed by all the bands)
Eden Nemesis NC410 320w combo amp
Check out Tyrannicide, my death/thrash metal band:
Well there is no such thing as "bass theory". There is music theory, for which there is a raft of lessons and stuff right here on UG. Just search in the lessons section.

Read up in the musicians section too. just reading posts an answers helped me loads when i was learning.
Or if you don't want to learn off the internet, and want to learn 'properly' (as in tuition, although there is no proper way to learn it really) get lessons. Or just get the grade books with accompanying guides.
Quote by SomeoneYouKnew
what would that be called? a Fibson with Gender confusion issues?
musictheory.net and emusictheory.com
not to threadjack or anything but is there a book specifically about counterpoint?