I am interest in this too, as I'm studying for 70-055 right now. You and I may be the only two people in the world who are interested in MCP+SB right now. There doesn't seem to be a lot of resources available for it. I posted a question very much like yours to the alt.certification.mcsd news group a couple of days ago, and have received no supplies.
Perhaps we can keep in touch here, and share what meager info we can find together. For instance, I found one site with a little information on 70-055, and an online test: http://emcsd.com/
Click on the "MCP+SB" link, and you'll see links for Frontpage 98, and the other two exams you can take for this cert. So far, this is just about all I've been able to find, except a couple of braindumps (not very helpful).
Let me know if you find anything.