For a computer without a built-in Mic, a USB Mic is a fairly common way of doing it. You could also claim that a USB port is not needed for a web cam, if you brought it in via firewire. That is why when I read back my reply concerning these points, I see the word "potential":
Again, why all the apparent frustration for accurate, honest discussion of these facts? These things seem pretty simple and obvious to me, and they bear pointing out in this thread.
I completely agree with you. Everyone may have different experiences, but when I changed from PC to Mac last week - there was no need for a hell of a lot of usb cables I used to have plugged in round the back.
I used to have:
1 usb webcam
1 usb bluetooth dongle (came with logitech wireless desktop)
1 usb keyboard (because the bloody logitech thing kept not working!)
1 usb mouse (ditto)
1 monitor usb extension (for 2 usb ports on the side of the screen)
so, I have cleaned up a lot of wires round the back eliminating the stuff I don't need anymore.
3 usb ports is a bit tight I suppose, but with the 2 on the keyboard for swapping in temporary stuff - I haven't even used the spare two on the back at all yet.
YMMV