Media Player Classic

Compact, but powerful media player. Plays anything under the sun. No install necessary.
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FeedReader

FeedReader; Simple, lightweight aggregator.

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RSSOwl

Solid cross-platform RSS client.
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VLC

Plays more video files than most players: Quicktime, AVI, DIVX, OGG, and more. Pretty good interface.
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OpenOffice.org

Big, full featured suite of tools for word processing and spreadsheets. Compatible with and a free replacement for Microsoft Word documents. Also supports OpenDocument Format.
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Audacity

Simple sound recording and editing tool.
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Paint.net

Graphics editor with a very nice interface.
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GIMP

Photo editing application that rivals Photoshop in features.
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Filezilla

Excellent FTP program.
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X-Chat 2

IRC client.
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