>> Should I buy an hd video camcorder and DSLR, or just a DSLR with hd video?

FR> I would get both. If you can find an assistant then you can shoot stills and video at the same time. On almost all DSLR's when you shoot video the autofocus is turned off. And the sound is usually mono too.

>> Can any of the DSLR cameras shoot both stills and video at the same time?

FR> No. You could extract stills from the video but it wouldn't be high quality

>> Or if one chooses to shoot stills, must one stop shooting hd video?

FR> Yes

>> Isn't the hdvideo camcorder easier to use for video/have better audio controls?

FR> Much better