I'm the Director of Architecture at Hotels.com. We provide complete Web
Services for air/car/hotel browsing and purchase via our Interactive
Affiliates Network (http://www.ian.com). You not only have access to
our entire travel inventory, but also earn a commission on each sale you
make. I spoke on these services at last year's JavaOne and as far as I
know, we are the only company that is providing this capability. Check
it out, I think it is exactly what you are looking for, and more.
I'm willing to discuss further with you directly, but I'm not sure how
to exchange personal contact information without putting it out there
for the world to see. Maybe there is a way via Google Groups?