
This may not be the coolest looking telephoto lens mod out there, but it just might get the job done. It only requires a bolt, some cardboard, a few twist ties, and binoculars. I am not sure this will hold up to moving around, but for that one telephoto shot you want to make, why not give it a try? – Link
Related:

DIY Telephoto lens – Link

Webcam Telescope from MAKE Volume 2, page 135 – Link

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I tried this today worked great!
Minox had an adapter for their push-pull spy style cameras that did this exact same thing. They work great. They even incorporated a shutter release holder.
aka ‘Digiscoping’: http://en.wikipedia.org/wiki/Digiscoping
I’ve tried this in the past with reasonable (but not great) results.
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Make: School’s Out! Summer Fun Guide
This Summer Fun Guide is brimming with over 50 projects for kids of all ages. You’ll also find inspiring young maker profiles, as well as tool reviews written for and by kids! Plus, it’s our 3D issue, complete with 3D glasses and tons of super-cool 3D photos!
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