Best free browser for anonymous surfing

[Ashwin]

Xerobank browser:

A modified version of firefox with pre-installed add-ons like noscript,etc.
Uses the Tor network to redirect you to a different sever, changes your IP so you can surf safely.

http://update.xerobank.com/distro/XeroBank/XeroBank_Installer.exe

Opera Tor:

Tor network with the power of the Opera browser

http://files.myopera.com/archetwist/operator/OperaTor-3.5.zip

Vidalia:

Another Tor powered browser

http://www.torproject.org/dist/vidalia-bundles/vidalia-bundle-0.2.1.24-0.2.7.exe

For free VPN services, read this awesome article:

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Jondofox website shows a poor WOT rating, if anyone knows any others please include it