I did a small freeware utility for the web content testing depended on user settings (browser name, accepted languages and referrer).
The application uses the IE engine, but on the server it will be identified as Netscape, Opera, Firefox, Google bot or anything you want.
If the server sends different content, you will see it. Also you can easy check content depended on user language or referrer.
For me it works fine, but still beta, because it's without help file and maybe with some bugs
The program is without installation.
ChameleonNavigator.exe: ~760 Kb
Flash presentation: ~595 Kb
Any comment will be appreciated!