Have you seen this new site: www.billiongraves.com?
They have an iPhone/Android app where you can take pictures of graves while at acemetery, upload the picture from your phone to billiongraves site with GPS coordinates (!) and then you and/or the research community will transcribe the grave records. The site is only three weeks old, so they're working on a lot of improvements, but I think it's a great start! If you don't have time to go to cemetery to take photos, you can help transcribe user submitted photos.
I was hoping findagrave would come out with a similar app...maybe they still will. In the meantime, I'm going to start using BillionGraves