Thank god I'm no longer and Ewok...
Ad-Ware, yes, it's probably the best anti-spyware program I've ever seen. Heard about it some time ago, and it's suprising what it finds.
Usually spyware installs itself, or through "accidental" confirmations, and it can eat up a great deal of bandwidth, and cause other programs to become unstable (they aren't well coded, and tend to leak memory like sieves. Which is bad). It's a small download (about 800k), it's freeware, and there's another small prog which updates the reference file on demand.
The url is www.lavasoft.nu