Screencast-O-Matic is the free and easy way to create a video recording of your screen (aka screencast) and upload it for free hosting all from your browser with no install!
iShowU is designed to record anything on your screen, instantly — both audio, and video!
Record Video Files for Free; use webcam, screen capture recordings
SnagIt screen capture lets you capture, edit, and share exactly what you see on your screen - fast
an example of a screencast on how to use CamStudio (by Leigh Blackall
ScreenHunter 5.0 Free is a completely free screen capture software for you to easily take screenshots
AviScreen is an application for capturing screen activity (ScreenCast) in the form of AVI video or images. Beside the usual options defining the capture area, AviScreen has a unique feature called “follow the cursor”. Using this mode you can produce a video or image of relatively small dimensions while covering all mouse activity over the whole screen area.
Check the comments section for more screencasting apps
uTipu offers one of the easiest ways of recording and sharing video screencasts online. Windows only
FreeScreenCast makes screencasting simple from the beginning to the end: Install screencast recorder, select part of the screen you want to record, record it, upload ready screencast, and share it with others. Please note that it works only with Windows PCs.
Using Wink you can capture screenshots, add explanations boxes, buttons, titles etc and generate a highly effective tutorial for your users. Windows only.
Press print screen and cannot grab the webpage outside of browser window? You need FireShot!
A flowgram combines the advantages of slide presentations and screencasts with an interactive user experience that fully exploits the fact that almost all the information we might ever need is already on the web.