How do I find out another computer's IP address on the network?

About ten minustes ago, I noticed a PC appearing on our local Airport network. Since the network is password protected, it startled me. That computer has no business on our network, and since sometimes internet is extremely slow and we even got an email once from some copyright reinforcer, I'm scared that this PC is the PC that might have illegally downloaded movies using our network. I tried to find ways to search for its IP, so I might be able to block it or something. However, I have no idea how to find its IP address, nor do I have any idea how to search for information of computers on the network. Could anybody offer a helping hand in that?

the first step would of course be to change the password wireless network. using WPA2 and a long, non-dictionary password should make your network reasonably secure.
also, ensure your wireless router is password protected (screen shots from my time capsule)
assuming the wireless router creating your network is an Apple product, launch airport utility (in applications > utilities) and enter manual setup for the device. in the summary tab, click on wireless clients
the next window will reveal the MAC addresses of wireless clients connected to your network
you could use the access control tab to allow/restrict access to your network by MAC address.

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