Depends what you wanna capture. If it's from a webcam, then that's all you need - either one built into a laptop (which is quite common in new ones now), or one plugged in.
If it's video from something else (VHS, camcorder etc...) then of course you'll need some input card. I use a Pinnacle Systems Studio DC10+ that I bought nearly 10 years ago (still runs an absolute treat in my XP setup) for all analogue video input, and a firewire connection for my miniDV video input (still in my mind the best format for digital video editing).
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If it's video from something else (VHS, camcorder etc...) then of course you'll need some input card. I use a Pinnacle Systems Studio DC10+ that I bought nearly 10 years ago (still runs an absolute treat in my XP setup) for all analogue video input, and a firewire connection for my miniDV video input (still in my mind the best format for digital video editing).