I never thought I would find a page like this, it’s great. It show you step by step how to do port forwarding. And since port forwarding is so terribly router specific, this one shows you for hundreds of well known brands and types.
I know this always comes into play when people need remote desktop aka ‘help out your mother/grandmother with the PC’. For anyone looking at this, I would also like to highly recommend crossloop, formerly known as ‘helponmypc’.