How to configure AD so that users who travel to different sites have the same Desktop and My Documents folders

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http://serverfault.com – I am settings up my Windows 2008 Active Directory environment so that users can travel between 2 sites and still access their Desktop and My Documents folders. Currently, we have 2 sites (Site A and Site B). Site A has been in existence for about a year and a half. Now, we are adding Site B, which has Server B. Site A and Site B are connected via VPN. I don't know the exact speed of the VPN but one location has 4Mbit symmetric broadband and the other has 100Mbit Fibre broadband. We opted to have a server in each location in the event that the VPN connection or Internet connection went do (HowTos)