Dan.C, all of the 192.168.x.x IP addresses are *private* addresses that can only be used inside your personal network. You should avoid giving out your external Internet (or WAN) IP whenever possible. Private IPs, such as 192.168.x.x cannot be used to hack into your system. Here is part of my ipconfig from Vista -- my Win7 is offline at the moment, but it's very similar.
C:\>ipconfig
Windows IP Configuration
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::9478:cd60:79c:b1a%8
IPv4 Address. . . . . . . . . . . : 192.168.1.106
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
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