Following on to the mixer thing, I was wondering how hard it'd be to make some oscilloscope-like hardware that plugs into a PC. Wikipedia has an article on test probes that's enlightening.
Maxim also has an article on designing a low-jitter clock, which can be used to drive high-speed ADCs. 1 GHz should be achievable. Using a USB interface would be too slow to do real-time processing, but by capturing into memory on a trigger and transferring the data, the PC could handle high-speed captures. Real-time could use less bandwidth to approximate the signal to the limit of USB 2.0.
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Hmm, apparently some affordable PC-based 'scopes exist:
BitScope
PicoTech
softDSP
USBee
There's some software to capture inputs using a PC sound card, but to me it's pretty much useless unless the sampling rate is at least 1 MHz....
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