Ewido (Now AVG antispy 7.5) was purchased by Grisoft and is considered an excellent anti trojan application. Good! Had one of those once, devil to remove! Rather less effective, but still fairly good as an antispy.
One of the better rated antispywares (according to a few of the geek sites I peruse) is SuperAntispyware. Comes in freeware and paid versions, same as AdAware, similar functionality. The only realtime freeware antispy programs I know of are SpywareTerminator (which I use) and SpyDefense (which I did use, but started to doubt as the updates were even less frequent than AdAware's)
Spybot S&D has an "immunise" feature which is worthwhile having.