Sorry, I didnt visit this page for all these days and missed your reply.
I would love to try out the Canon version, if you could mail it to me at
ardhuru@gmail.com.
The wired version would be fairly simple to make (in terms of hardware); what I would require from you would be an output of a continuous 1kHz (or 100 Hz, not sure which would work better at this stage) for about 100ms; the hardware would then drive a small FET to 'short' the required signal with ground. Trust me, not only would this make the project more robust and reliable, it would be brand-unspecific, as the same app would work with any brand of DSLR that requires a pin to be grounded for shutter release.
Regards,
Anand Dhuru