This is a follow on to my post on problems with installation of the Mega R3 board.
There are many other problems that pop up daily on the forum, and end up being endlessly regurgitated on the forums. The issue of people having trouble getting their XBee shields to work is one of them. Another one is voltage regulator and board powering problems. There are many common software issues. On and on.
So responders end up going through the same list of suggestions time after time after time.
It seems to be difficult to get actual changes put onto the main Arduino site, so maybe there should be a WIKIPEDIA FOR COMMON ARDUINO PROBLEMS. Then, the same people who are daily responding to the same old problems could post a list of suggestions in an easily found place. Maybe it could even be a section of this Forum, placed ahead of this topic area.
The Playground is helpful, but doesn't specifically address the same problems people are having time after time. Nick Gammon and others have really good info on their own personal websites, but of course people have to be specifically directed to those pages. So .....