I fully support having posts written in correct English.
As Magic Torch said, it is a already a rule although there are so many 'Rules Stickies' posted around the place at the moment that it's understandable why some people may never have read it.
One of the ideas I'm toying with is actually giving long-standing members the ability to Moderate/Delete threads.. more on this soon!
Either way, it'll be changing in the near future - just give me a couple of weeks to get on top of things.
L