Not really…

So, I really need a lightweight but GOOD virus scanner that I can run portably (i.e. "green") from my USB stick. Avast U3 edition was and still is the best I've found.
What I'm really looking for, however, is a version of avast! that I can install on my USB stick and run from there without leaving traces on the host computer. This is typically known as a "green install" -- where the software stores all its configuration data in a disk file (such as an .INI or .dat file) instead of storing it in the registry.