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Adium
Adium - Download

Adium is a chat application for OSX that is basically Trillian. It runs all major chat services (AIM, YIM, MSN, GTalk, ICQ) and a bunch of more eclectic ones. It's open-source and thus has a huge developer community. Scripts and modifications are available in an achive on the site.

Google Earth
Google Earth

Find anyplace, anywhere in the world, and directions to any other point. Supports lat/long points. Handy.

Hotspot Shield
AnchorFree

Lets you surf the net anoymously. Handy if you're on college networks with restrictions, or generally on a sketchy network.