For specific articles, the Google cache is a good place to turn to, to see historical information that might have been removed/changed. Not quite what you're l

For specific articles, the Google cache is a good place to turn to, to see historical information that might have been removed/changed. Not quite what you're looking for, though. There are screenshot capturing services out there, too, but again, more intended for one-time use only as opposed to frequently capturing state.