Whitestar,
If you already have a digital camcorder, you can use it.
Most digital camcorders have what is called "pass through" mode.
If your digital camcorder has this mode you can play out of
some other device, say an 8mm camcorder into the digital
camcorder which will convert the analog signal into a digital
signal and send it through the firewire/usb cable into your computer.
Take a look at this webpage, it should help you out.
http://www.techlore.com/article/10266/HTH
MG