Selected Bisexuality Resources

The point of this page, as with all resource pages, is that Google doesn't tell you the difference between the good pages and the useless pages. In addition, when searching for information related to sexual orientation, there's a nontrivial risk of happening on unsavory material. Unless something has changed since I last researched these links, you'll find nothing of the sort at any of them.

The Bisexual Resource Center is in Boston, but still serves most of the world.
The Bisexual Organizing Project is based in the Twin Cities of Minnesota.
BiNet USA
Bisexual.org is a portal and project of the American Institute of Bisexuality
an annotated bibliography of print and web resources on bisexuality from the Institute for Welcoming Resources, a part of the welcoming church movement
a short annotated bibliography of books on bisexuality from TrueColors

There are lots of local/regional social and support groups. It's currently not clear what the simplest way to find them is.
Regional, national, and international bisexuality conferences (which usually have a mix of support, activist, social, and academic content) are generally announced on some of the above pages.