i think what he means is that if you run another spyware program next to ad-aware and spybot-search and destroy, you will still find spyware.

this is true, in my opinion there is only one program that gets it all, and that's because it uses ALL the tested and approved spyware removers on the net:

HITMAN pro, works like a charm but it does take quite some time to install and sweep your computer (especially if you have a slow inet connection and loads of spyware on your computer)

but indeed ad-aware is NOT spyware, nor is Spybot.