Joe,
I tried Camtasia Studio & it is an excellent software, although a little too expensive for what I had in mind at the time, but I do have a good suggestion. It's one of the 2 choices they offer for a trial sampling of their product, so not really a clearcut abuse of privilege, but maybe a bit of a line call in that regard. You can download a 30 day trial, which gives you 30 days, but they also offer to ship out a disc for the 30 day trial. I had them ship the disc, because all too often I DL a trial, test it for an hour... and a month later when I'm really ready to get some extensive testing done... DENIED!
So, with the disc, I just loaded it again & started up my 30 day clock. This was a few years ago, and I haven't used it for anywhere near even 15 days... but if I ever had a real extensive project, I would buy it. You can hook up a microphone & talk about the tutorial while you capture the navigation of the project on your screen.