I took the time necessary to do a clean install of FreeBSD 6.1 on my dual processor Compaq last evening. It was, as is usually the case with FreeBSD, a very painless process.
The only thing that was a bit annoying was setting up the SMP part of the kernel. By default, FreeBSD does not use a kernel that supports multiple processors. Fortunately, this is a simple thing to do (although it did take quite a while to compile).
Tonight I hope to start experimenting with Samba, and see how much it's changed since I last gave it any consideration. I'll also install rdiff-backup, as (if things go well) I'll need it fairly soon anyway.