I've just posted Part 2 of a two-part series on writing and responding to Requests for Proposals to BFWire. Part 1 is from the perspective of a potential client writing an RFP. Part 2 is from the perspective of a potential vendor writing a response. Go check 'em out and tell me what I got wrong.
Edited to add: there's a discussion about this very topic going on at Acronym as well, so check it out, too!