USB is the most common connection that manufacturers use for webcams, but you can still find older ones with a parallel/serial port (very low quality) or Firewire (just like digital camcorders).
Ask about battery life span, an FM radio receiver (this will identify the title and artist of a band you hear on the radio), and USB or FireWire ports for quick connection to your computer.
A good computer for gaming needs to have numerous ports including USB, FireWire, headphone, and microphone ports in order to accommodate all of these devices.
Computers with USB, audio, video and Firewire ports on the front of the machine are much more convenient and allow you to make your connections fast and easy.
FireWire is a faster connection and is excellent if you plan on scan a lot of photos or need high quality digital images that will become a large file.
For a little extra money, you can get a scanner that has FireWire capabilities.
What kind of ports do I need (USB, Firewire, etc.)?