I have produced some pretty good product videos with my SLR. You can easily explain a product in two minutes, just make sure you map out a script and time everything. Write and rewrite the script until you have it perfect, then go for it. YouTube is great for examples, and people even have some tutorials up there.
When I was in the Xbox 360 business, I did lots of videos for my company's YouTube page and I made lots of sales from just that. Even had people commenting on the video that they went and ordered it.