From Bluefive Software:
IPaddress is a tiny utility that you can use to determine your IP address and lets you copy it to the computer's Clipboard. You can then paste it from there into whatever application or document that requires it. You can also send your IP address with the build-in e-mail engine to fellow gamers or to friends or to colleagues at the office so that they can find your computer for remote access. Both WAN and LAN are supported.
Finds both your WAN and LAN IP addresses.
Allows you to save them or copy them to the clipboard.
Information window with search functionality to find the source of a particular IP.
Send the IP address to your friends with build-in e-mail (supports Exchange Server).
Keeps a history log of your IP addresses.