To create my new intro for SH4 (which essentially involved the same process you want to use to create a tutorial) I used FRAPS, which saves your 3D games as video clips (warning, these are BIG files).
When I had all the shots I needed, I then arranged them and overlayed sound using Windows Movie Maker (I recorded the sounds with a basic PC headset mike in media player). You'll find windows Movie Maker in the Windows start menu under accessories.
This method is probably the cheapest and easiest way to do that kind of thing, as the movie file you eventually save when it's all edited to your satisfaction, has lots of options to get your file size as small as possible.
Although you would have to buy FRAPS to do it this way, which I seem to recall cost me about 20 quid (US 40 Dollars approx), FRAPS is great fun and probably a must if you like to watch replays of your games and sims and make movies from them.
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