I'm noticing an occasional browser hijack for search results when I first click on a session in Google Search. I'm taken to a website not intended that's only in an ip address format that's another type of keyword search site. The really odd thing is that it doesn't happen frequently enough to guess when I'll be hijacked again. It doesn't seem to do anything negative to my system other than the fact that I have to manually go back to google.com and click again to get to what I wanted.
I only see this on my OS X system, which is up to date, but held back to 10.5.8
I haven't noticed this on my Windows 7 laptop.
I've googled around and find people with this problem, but not independently for an OS, like on OS X for me.