If you go over to http://www.helpspot.com you’ll see a demo tab at the bottom. We use a service to embed the tab and setup the demo’s. It also creates the GoToMeeting event for us (which is what we use for the actual demo’s). I’ve tried a lot of other services but none have worked as well as GTM, which isn’t great just not horrible which is as good as I’ve come to expect.
Also, most people we’re doing demo’s for are larger businesses that have used GTM before so they’re usually pretty comfortable with it.
The service that does the tab and demo page is http://www.scheduleonce.com/. Probably could build the same thing, but just used that to get it going. We used to only do them on request before, but being more pro-active has paid off so far. We’re working on a new store now that will tie in the info on demo’s so I can have more definitive data, but even rough data shows a pretty good conversion on people we demo.
Demo’s are pretty tricky to automatically track conversion on because often the person who signs up isn’t the one who buys, so you have to manually match them up much of the time.