Ahahha, coggy, you need a bit of practice for all teh new options in win 2008 server, but it works great, use the r2 version 64 bit, service pack1, it is very fast and light, and if you use win7 64 bit as client you will have no probs.
With xp you have some problems on certificates and drivers share, most becouse xp is at 32 bit, nothing that is not fixable, but take some time to work around, while with 7 is all so fast to config
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Tomorrow deplyng a new 2008 r2 sp1 64 bit server to a customer plus some clients, network upgrade to lan gigabit with cisco and well this weekend i will sleep instead of going to disco