http://sm.gpona.com:9001/si/home.do
Someone posted this link some time ago and I've used it a couple times. When I went to use it today, it asked me for a username and password. Does this mean it's an unauthorized version I have access to? It's access to service/repair manuals for GM - I'm not sure of the origin, though and it's never asked for a password, so I assumed it was a non-issue to use it.