I just rebuilt my PF-Sense server back on my XenServer 5.0 Enterprise Edition. It is working like a charm. I am using verison:
1.2.3-PRERELEASE-TESTING-VERSION
built on Sat Mar 28 00:13:48 EDT 2009
It is extreamly stable and very fast. I am running serveral services and seeing a little slow response but I am will to take that with all the new virus's running around. A little extra protection is work it.
As far as my configuration goes:
I have a dedicated nic for the WAN interface, LAN interface and a shared interface on the OPT1 interface. No issues here.
Citrix is now providing enterprise product for free. It works great.
RC