Joost De Valk created a Google de-Personalized Search plug-in which can can be used in both Firefox and Internet Explorer 7. Meaning, now you can search without logging out of Google and still receive depersonalized SERPs.
One webmaster writes, "Seriously cool work, Joost! Thanks for providing the community with a practical tool. It may be a simple tool, but its the simple things that sometimes don't appreciated enough. (plus, I don't have to enter &pws=0 after each search either.) "