Record your screen with microphone using Hypercam and ezvid for free

There are server software to record screen with microphone: camtasia  (not free), www.screenr.com (free account maximum 5 minutes, save as mp4), ezvid (maximum 45 minutes)  and this one Hypercam (no time limit, free, save as avi).

Hypercam for Windows can be downloaded from:
http://www.hyperionics.com/hc/downloads.asp

HyperCam supports text annotations, sound, and screen notes (great for creating automated software demos and software training!). You can also select Frame rate and compression quality prior to recording your movie.  But HyperCam is not intended for re-recording of other video clips from the screen (e.g. playing in Media Player, RealVideo, QuickTime etc.), but rather for creating regular software presentations, tutorial, demos etc.

ezvid has a lot of nice features, such as insert symbol, text pronunciation, video editing. ezvid can be downloaded from:
 http://www.ezvid.com

Video: How to use ezvid: