http://portableapps.com/
Nice menu and a bunch of apps that have been packaged to be completely portable.
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.
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.
I would also like to add the following site: http://www.portablefreeware.com/
Lists freeware and shareware apps.