Portable версии браузеров
Portable версии основных браузеров (IE, Opera, Firefox, Chrome и др.)
http://torwald.ru/72/portable-%d0%b2%d0%b5%d1%80%d1%81%d0%b8%d0%b8-%d0%be%d1%81%d0%bd%d0%be%d0%b2%d0%bd%d1%8b%d1%85-%d0%b1%d1%80%d0%b0%d1%83%d0%b7%d0%b5%d1%80%d0%be%d0%b2/

Mozilla Firefox, Portable Edition (+ Яндекс)
http://portableapps.com/ru
http://downloads.sourceforge.net/portableapps/FirefoxPortable_3.6.3_Russian.paf.exe?download

OperaUsb
http://www.opera-usb.com/
http://www.opera-usb.com/ru/index.htm

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http://portablebox.net/