These are interesting things that we’ve found and collected. They aren’t necessarily noted in order of when they were found.
Touche framework an OS X specific tool for converting webcam blobs to TUIO touch data.
Community Core Vision ccv; a cross platform app for taking input from a webcam and converting it into TUIO protocol for touch interfaces.
Cool set of drivers for running USB webcams on macs: macam
This is some pretty interesting datavis over time. From where else? TED of course.
jott/ allows a vocal interface to a service that converts voice to text. Using this service you can do things like perform queries, setup notes/reminders, email people, blog; all from your phone. I saw someone else had used this on their blog and it seemed cool, a little odd that you could hear what they said.