+2  A: 

There are a number of them. WhatsMyBrowser.com is a good one.

Mitchel Sellers  2010-07-28 18:58:25
Doesn't look like the information is very accurate, at least for me. I'm running the latest version of Chrome, and it says that neither JavaScript nor CSS are supported. Which is crazy.
Adam Crossland  2010-07-28 19:00:28
I'm thinking of one in particular that is graphical. It detects: browser, browser version, screen resolution, ip address, javascript on/off, flash version, color depth...
codemonkey613  2010-07-28 19:03:37
+1  A: 

Found it. Was thinking of : http://www.supportdetails.com

codemonkey613  2010-07-28 19:13:19

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