I just have to say that there is one big flaw in the concept of the leaktest
program. In order for it to run on a target machine, the user there has to
allow it to run.
Most trojans need to be allowed to run on the target machine before they can
take up residence and open back doors, or they hack in. Programs like
BlackIce, ZoneAlarm, etc. directly address hackers and trojans trying to
break into a system.
It isn't smart to download a program and run it before testing it for
viruses, trojans, etc. A good virus scanner like McAfee or Norton should do
the trick here.
With this combination you should be able to stop almost all trojans from
gaining residence on your machine.