Real-time pitch detector using boosting:

Check out the historical SIFT algorithm, which 
used multiple pitch detectors to come up with a 
final best pitch estimate.  It's old though, and
we didn't know about boosting yet.

Also check out Miller Puckette's Fourier domain 
pitch detector, and the fidl~ object for Max/MSP.
The source should be available somewhere.

Also see the various pitch detectors I've plopped
in the Pitch directory in the course /src tree.

Also check with Dexter Doyle, who worked on two
pitch detectors for independent work last semester.
Actually Dexter did port fidl~ to ChucK, so you
could get his code.

Forge ahead!!