We can tell by the sales log - there are a lot of newcomers! We can tell by the forums, there are a lot of very seasoned veterans and talented developers. Want to know how you can help? Check out the new Missing Features page on the wiki: http://wiki.leaflabs.com/index.php?title=Missing_Features
Add to the list, post relevant links to known progress, or just get hacking! We DO merge in pull requests from time to time...keep them coming!