Firstly, I have also had this problem, on multiple computers. On my Mac, my two Windows, etc.
Here is my "solution:"
I was researching this and while researching it an idea popped into my head: Just block the ip address of results.
___.com. To do this (since the firewall in Snow Leopard doesn't have the option to block individual ip addresses), I downloaded the free firewall NoobProof at
http://www.hanynet.com/noobproof/ and added the ip addresses for results.
_____.com to the blacklist. To find the ip addresses of the annoying popups, go to Network Utility and select Lookup. Then simply put in the web address of the popup. This will give you all the addresses of that URL.
The ones that I looked up (because these are the popups I receive) are: results.gugle.com, results.googlesyndication.com, and results.google-analytics.com. The three ip addresses that I found and blocked were: 205.234.231.39, 205.234.201.229, and 75.102.23.111. This does not 'sadly' remove the "infection" but it does stop the popups.
Hope this helps! (MacScan, MainMenu, Disk Utility, Hitman Pro, Malwarebytes, and Spybot S&D didn't do anything for me!!!)
--EDIT--
Make sure you save the configuration to startup at boot: In NoobProof go to Tools and select Install Startup Script and Save to startup configuration
On a personal note this is not google. I believe this is someone that does NOT like google at all and whats to ruin there name. There seems to be nothing wrong with anything else other than the popups. My two cents
Message was edited by: TeenAssassin