video camera?

I’m researching video cameras for work to be used for (a) usability testing and (b) internal marketing videos that will mostly be seen on desktop computers, but also occasionally projected onto a larger screen.

I’m entirely clueless about video cameras. Can you help? (All eight of you.)

Any recommendations or warnings are welcome!

(I’m also on a bit of a short turn-around; we’ve got usability testing scheduled starting after my vacation next month.)