Cybernetnews found another great app:
ThreatFire. Free version available.
ThreatFire is dramatically different to traditional antivirus software. Normal antivirus products usually need to have first identified and seen a threat before they can provide adequate protection against it. The protection is then provided via a signature or fingerprint update, which must first be written by an antivirus researcher. This creates a large window of time where threats are undetected and can therefore infect your PC even when you have antivirus software installed.
from Cybernetnews.comInstalled it on two pcs, two scans found 2 hidden xml files in my temporary internet files which naturally shouldn’t be there - otherwise they came out clear. Am impressed with it not having any noticeable effect on performance on me, desktop search has a lot bigger slowdown then this. So even though I’m not running any realtime anti-spyware app, i now keep this running.
This kind of application can be useful to run in addtion to regular defenses as it blocks in behaviour not on definitions meaning it can block suspected activity without knowing what's causing it. You can also set your own rules if you care to get creative blocking certain processes for your own reasons.