Snagit software $$ (my personal choice)
Camtasia software $$$
screenr.com FREE (This one has my vote for free sites)
PowToon FREE with limits
Wikispaces FREE (great for sharing information/videos)
Coursesites FREE (best for collaboration
Well... you might not use it as a student portfolio or in your PD, but why not?
First, let me begin by telling you about a wikispace. A wikispace is a FREE online tool where you can share anything you can think of.. pictures, files, important info