I am able to get Remote Desktop connection in both the XP Pro and Vista on a dual boot machine. Connection is good, and response time is very good between the machines from both OS's.
I had been having connect issues with Remote assistance during the Vista beta which were found by the Vista RA team to be related to my NetGear router. They were going to be working with the NetGear people for a solution. However, it seems the RD will work, at least, within the home network.