When WGA first came out, I unselected it and also said not to show this again. It hasn't popped up since. I did get the regular updates this last round too, and WGA didn't show up again.
I'll probably have to put it on when I want to download something from MS, but there's nothing I need to download other than security fixes, so I say screw WGA. Don't care about IE7, Defender, DX10 is Vista only...
Anyways, I was talking with someone yesterday who had an update that just would not go away for some reason. Computer is set to auto-update each night. But every day there's that dang yellow shield with the balloon message saying updates are ready to install. There were two there, one was maybe virtual machine something, and the other was the malicious software removal tool. For whatever reason they either will not install, or not remember that they were installed.