It looks like you added a line to your sources.list that you were instead supposed to run.
1) Add only the line starting "deb" to your sources.list
2) Run the wget command (this downloads a "signature" for the new repository you added to sources.list so that when apt/aptitude tries to get files from here, it knows it's a "trusted source")
3) Continue with the guide, and you'll be in wobbly window heaven soon!
Edit: You were definitely barking up the right tree Audio, sorry to snipe your answer