I bought a g5 video ipod compatible Belkin Tune-Talk today (microphone) .... It doesn't work.
Virtually no accessories (accept apple-made products) function with the classic. The folks at Belkin said they were blind-sided with this release (i.e. not given any non-disclosure agreement to sign in order to develop new, compatible accessories for a simultaneous roll-out with the new Apple products). So, they are now scrambling at Belkin, as every other vendor is. It will take weeks or months before this mess is sorted out. Even the Apple store "geniuses" were flying in the dark ("yeah go ahead and buy the Tune-talk, the video ipod stuff will work with the classic"), and so was Apple tech support (some nice, but outsourced Indian-sounding fellow answered who had no idea what was going on=deer in the headlights syndrome).
MACNN.com reports that the problem rests with vendor products not being able to establish screen control over the new Apple products. I can confirm that from my own experience.
Now I have to go back to the store and return this useless accessory, which takes time off my life and lowers the joy quotient of purchasing Apple ... and all this simply because somebody in charge of the roll out never thought of informing Apple "geniuses" that accessories are broken (which could have been accomplished through a simple form lettered faxed or e-mailed to each store manager).
Good luck all!