I once had an idea for a portable speed-dial device that you held up to a payphone to dial any of, say, 100 stored numbers. Software with that capability on PDAs were the first nail in the coffin for me on that idea; that someone had done it before, along with the whole rise of cellphones thing, pretty much sealed the deal. This would still have been interesting to read back then, though:
The appnote basically gives the derivation of a DDS system for DTMF signals, and the included flowcharts and descriptions would make this a snap to implement on any microcontroller, Atmel or otherwise.
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