Re: NFS support roadmap for SRM+SRA, Vmotion, Storage Vmotion
SRM+SRA - not supported and also won't work - I've heard should be out by the end of Q2.
vMotion - already fully supported with NFS datastores (has been for a while actually -- since 3.0 I believe)
Storage vMotion - not supported in 3.5 but DOES work without any issues (I've done a ton) - I haven't checked/nailed down yet if svmotions involving NFS datastores are officially supported in vSphere 4.
Per the post 3.5U2 update and info in TR-3428 you REALLY do want to have the right lock settings + patch if using NFS datastores.