Someone popped up today with a classic iPhone 3GS, looking for docs on the VoiceControl system. Sadly, Apple has long since expunged nearly everything VoiceControl related from their main site.
Following some links, I hopped over to the Internet WayBack machine to find that not much has been saved. Although the main voice control page was there, few of the secondary pages, videos, or assets were archived. (You can still link to a couple of audio clips, and the second one on making calls still plays.)
I finally googled up the iPhone iOS 3.1 user guide, which contains about a page and a half of text. This material is still hosted, and I’d imagine this continuing for the foreseeable future.
It was an interesting reminder about the fleeting nature of information.