Solarbotics - The place to go for all your BEAM needs. Great products and wonderful service.
The Grant BEAM Page - Probably my favorite BEAM related site. Lots of wonderful pictures and good descriptions. The video section is also quite extensive.
solarbotics.net - Another great BEAM resource. Links to various personal pages, lots of information, and free web hosting for BEAM related sites.
Yahoo BEAM Group - Good place to keep up with what's happening in the BEAM community. Great mailing list also. A little heavy on the daily messages, but well worth it.
Bicore Article - A must read if you need help understanding bicores. Was a big help to me.