The good folks at TechSmith are giving away previous versions of SnagIt and Camtasia for free. After you install the free version of the software, you have the option of upgrading to the current version for half price (the TechSmith site currently lists Camtasia 5.0 for $299 and SnagIt 8.2 for $39.95).
Camtasia - record, edit, and share screen videos
Download Camtasia 3.1.2 here, and register the software here.
SnagIt - capture, annotate, and edit screen shots
Download SnagIt 7.2 here, and register the software here.
Thanks to Productivity Portfolio for this tip.