Since it's release i've been doubtful that Google's package of software applications (Google Pack....which is for Windows only) has anything worthwhile. All of the applications are available seperately so I didn't see the point.

I still don't see the point but while researching how to remove a particularly stubborn piece of adware (a trojan downloader) I stubled accross the special version of Spyware Doctor which is included in Google's Pack. Yahoo's adware/spyware product (which is really Computer Associates adware product) included with their toolbar found the dowloader and said it removed it but the downloader was still there. 

I downloaded Google's Pack installer and selected to only install Spyware Doctor (which seems like a limited/special version). I then ran a scan and it detected a removed the trojan.

Spyware Doctor also includes some sort of real time scanning that I haven't had time to fully evaluate. If you have adware/spyware issues I recommended that you give Google Pack and Spyware Doctor a try.