This is a huge step in the right direction toward my programmable camera idea… 

Check out the open source project to create new firmware for the Canon 5D Mark II, codenamed Magic Lantern.  This project is still in beta, and they seem to be focusing primarily on improving the video aspects of the camera, but it works!  And I want it for my 40D.  It sounds like Magic Lantern could be quite quickly ported over to the 50D since they use a similar operating system, but the 40D appears to be an ugly stepchild that is difficult to hack.  I’m might just have to upgrade to the 5D (or maybe to the 1D Mark IV that is rumored to be forthcoming in the fall).

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1. Canon EOS 5D Mark II Firmware Update
2. Early Review of the Canon 1D Mark IV
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4. 5 Reasons Why I’m Excited by the Canon 7D
5. Canon 1D Mark IV Announced