A friend of mine also just recommended CamStudio to me - said he had better results with it that with BSR. I haven't used it personally
but plan on trying it. Do believe, at least from the notes, that you can get sound and it has a lot of potential in other areas, not the least being that the source code is available.
I suggest you read the notes and even the blog about the program if you are trying to use it - the 2.5 version especially looks like it is truely Beta software, with all the "fun" that implies. (Also notice the oddity that 2.0 is actually a later release than 2.1.)
Will post some updates as I learn more.