Photoshop:
1. Adjusting warped photos (14MB, 2min) OR
YouTube version
2. Correcting poor lighting (22MB, 3min)
Adobe Acrobat Professional PDF
1. Adding pages (10MB, 2 min)
2. Linking Pages (20 MB, 4 min)
I've experimented with making these video demos using Camtasia software. It lets you record the screen and then edit it and add titles, etc. To get a useful result takes a lot of practice and still there are little audio blips that I'm having trouble editing out.