Page Headers now lets you choose the user agent that is used to request the page from the server. Why is this useful? Some websites use underhanded methods to get higher ranking in Google and using Page Headers you can see if they are pushing a different page to Googlebot (Google’s spider) than what is push to a user of Firefox. I tried to include some of the more popular agents out there, like: IE, Firefox, Yahoo, Google, MSN, Opera, Askjeeves.

Have one you wanted added? Just ask.

Link:
http://pageheaders.com/

About User Agents:
http://en.wikipedia.org/wiki/User_agent

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  5. Page Speed release by Google
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  7. How to Fake a Google Page Rank 10