going entirely by memory, i think apple only releases those types of numbers in quarterly fashon at the investor meeting in January... unless, in the case of the iTMS, Jobs decides to impress us all early...
Additionally, I do not think that Apple releases figures on all products. Only major ones. We could have a discussion on whether Apple considers the iSight like the iPod, in which that case it would have its own numbers released, or something like an iPod accessory, in which case it wouldn't.
I believe the former, and estimate that there will be around 20,000 iSights sold since the release.