Live/CD Support - Firefox Portable supports running from a CD or other read-only media right out of the box. You just need change one setting to do it, too.

Since Mozilla released Thunderbird 2.0 Alpha 1 I decided to put together a portable version for the several requests that I had. If you are looking for a more stable version John Haller has it over at PortableApps.com.

Update: I have put together a portable version of this build.

Tezaa, an online web service that is all about polls is described as a 'community-driven knowledge base of opinions.' With this service, people are able to create polls, and vote on a variety of topics from technology to sports. Tezaa is said to 'aggregate public perception and opinions allowing everyone to benefit from information sharing.'