So I bought my 7D a while ago meaning my older 30D gets very little use and it could definitely have a better life. I would like to find some projects that would put this extra camera back to work. I'm open other suggestions but I've primarily thought of projects in these two directions:
A project that requires two cameras
I can't really think of anything here. Maybe something along the line of capturing a moment with both cameras, at different angles/focus/etc, at the same time.
A project that modifies the additional camera
I would be open to suggestions such as Magic Lanter, CHDK and such things but I assume the 30D may be a bit dated for such mods, as I haven't found any that support the 30D. I'm also open to suggestions such as infra-red modifications
And of course "just keep it as a backup" is a perfectly valid answer.
I am looking for answers more precisely for the 30D but to keep the information as useful as possible, feel free to give more general answers.