I've only got 19 days left on my Spysweeper subscription, so I was wondering the differences between the full version that I have and the freeware version that is in the above link.
I find Spysweeper very useful, and that in conjunction with my Norton AV 2006(which also expires in 20 days, I have had nary a problem with spyware/viruses. Whenever I run my Adaware(awesome program!, I will get two tracking cookies and that is it, and those are of the lowest threat level possible on Adaware.