I'm a Kite Aerial Photographer (I use an 11 metre carbon-fibre fishing pole too) so the ability to trigger the shutter remotely was the main reason I started using CHDK back in 2007. I did some work on mode-switching for the A570 and a few other cameras but was grateful when David Sykes made this a standard feature of SDM and others then did the same for CHDK.
Software Tools I've Written 
Edit
Among other CHDK- and SDM- related tools I've written are:
ACID SDMInst LICKS UBDebug CFGEdit
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