What logic boards does the BeOS for Intel support?

http://www.be.com/products/beosreadylist.html

However, keep in mind that this is a semi-impossible question to answer, given that there are a huge number of motherboards in existence based on the Intel Architecture.

In general, the BeOS will support most logic boards which are based on processors and core logic chip sets supported by the BeOS, so see the answers to those questions instead.