Other interesting links:
J. Paul Morrison: Flow-Based Programming
Martin Wattenberg: Data visualization. New media art. Collective intelligence.
Joa Ebert's Simple Astro Synthesizer written in Flex:
(I haven't made any changes to this yet, so far just built it from source.)
Charles Petzold's Simple Sequencer for Silverlight 3.
Still to check out: Standing Wave.