> What's the typical data rate of an IR remote?  I thought they were  
> pretty low, despite the ~40kHz carrier.  (hmm.  over 500bps for
> RC5?   Not so bad after all.)

I used to use the Plessey MV500/MV601 pair in projects. They don't
use a carrier. It was a PPM system, 6ms for a '0' period and 4ms for
a '1' period, with IR pulses of 8 clock cycles marking the bit boundaries.
Typically 8 cycles at 455kHz (cheap IF ceramic resonator) or just 17us.
Never had any problems with them, so the potential is there, by reducing
the '0' and '1' periods, for quite high bit rates. The key was having good
LED drive. Low saturation voltage Zetex transistor, low value series
resistor and a reservoir cap
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