Did you know that if you take a strip of masking tape, one cheapy Dell stick microphone (which came with some of our old systems at work) combined with my mini camera tripod, a creatively bent coat hanger and one of my daughter's nylons for a wind/breath screen, you can actually record a screencast with narration? Hah!
It took about 4 takes before I was even remotely satisfied that it was audible enough. The sound seemed so low and hissy at first. Still, it's not the greatest - and of course YouTube has simply butchered the video quality, but it might be useful to some.
In this screencast I create a quicky glass globe. Now, as I've mentioned ad nauseum, I'm no Inkscape expert or graphic designer. If you've got Inkscape tips or some other constructive criticism, please, let's hear it!