PortableApps.com take a bunch of useful apps with you on your flash drive

[Lazybones]

http://portableapps.com/

Nice menu and a bunch of apps that have been packaged to be completely portable.

[Mr. Analog]

Now that is slick dude.

Never get stuck without an editor again. I use OpenOffice a fair bit at home and having it handy wherever I go would be a big plus.

[Lazybones]

the site lists only open source apps but nothing stops you from putting other portable friendly apps lie foxit on there and launching them from the menu.

[Lazybones]

I would also like to add the following site: http://www.portablefreeware.com/

Lists freeware and shareware apps.