A comprehensive database of coffeshops around the country that AREN'T Starbucks.
Want to buy Bitcoins but want to do it locally? Look to seee who's selling them near where you live (or search by zip code).
XowA does one thing and does it well: It lets you make a local backup of Wikipedia (probably any Mediawiki, really) to carry around with you or copy to removable media (like a USB key or DVD-ROMs) so you can give out copies and read it offline. Runs on Windows, Linux, and MacOSX. Portable - can be run from removable media. Even includes a search engine. Written in Java.