Myscreencast.com, a library of categorised screencasts, is worth checking out.

This is where I found Phil Jones' DebugCast (more from Phil here):

"it's improvised rather than scripted. (Hence has that patent podcast-style mumbling and uncertainty.) My aim was to capture how I go about fixing bugs that had been reported to me. I also wanted to use it to introduce developers who might be interested in working on SdiDesk to one corner of the codebase. "

(Written in VB, SdiDesk (full name : Smart Disorganized Individual Desk) is a note-taking, organizing, authoring application for people who need to keep and find a lot of fragmentary ideas)

My favourite highlight of the DebugCast:

"Well, it's not blown up, so that's an improvement."