Well, I just ordered one. And now typing this, I realized I forgot to use the amazon link here.
I'm going to start simple with short sequences. My computer (being 32-bit XP dual-core and only 2GB RAM) won't be able to handle monster HD videos. I figure I should use the small picture size (3.8 MP for 50D or 5-ish MP for 5D) since even at HD, it's just 2MP output. (Unless I wanted some serious cropping or panning).
All I have is Windows Movie Maker XP for now. The version I have seems to only output up to 720x480, and when making a slide show, each slide takes up 4 frames minimum, which will result in 7.5 FPS video. Not the greatest, but can still be useful to practice with. I'll probaby need a better PC before tackling anything HD anyways.
I've seen alot of vids with exposure flickering. Outside of manual adjustments (one frame at a time), I'm guessing I'd have to find specialized software to iron those out more easily. I suppose if I shoot in full manual mode and lock it down would reduce most of it... but I've heard electronic apertures add their own flicker, too.