TechSmith has announced its latest versions of Camtasia, 9 for Windows machines and 3 for Macs. Most of the improvements seem to be for recording and editing video.
The only ones I am familiar with are Adobe Voice and Echo 360. I have used Adobe Voice and like it.
I agree with Travis Grandy. Students won’t watch a 45 minute lecture on video. Most of them should be no more than 5 to 10 minutes.