Expert based behavior blockers include: Cyberhawk/ThreatFire, Norton Antibot/Primary Response SafeConnect, Prevx and Safe n Sec. Until recently I have used Prevx (for a the last 12 or so months). Prevx has been pretty good .... but is quite heavy on the system. I like the community db white/black listing ..... but the standard hips component is ok rather than great. Threatfire on the otherhand is very light but my sense is that protection is not as full and the db operates in a different way..... rather than white/black listing. So I guess threatfire is better at real-time behavioral analysis. I have tried them both ... they are difficult to test because of the way they treat test tools. Which offers the best complement to KAV/ Outpost? What do you think of the way the community db?