One thing I'd particularly like when dealing with my parents' issues is an _easy_ way to set up remote screenshare and access. It's one thing when the problem is that their computer isn't booting (in which this site would definitely help ;)), but another if the problem is that they can't find a file they downloaded or something like that. I'd pay for a tool like this that was easy to set up and use that didn't have t…
Just open up messages on both computer -> go to your parents' contact -> click details -> click the button next to their name that looks like two screens (it's next to the video chat button). It'll ring on their computer, all they have to do is accept.
Edit: Apparently you can just spotlight search for the "screen sharing" application and just type in their apple id.