I find typos annoying, and blatant misuse of language even worse..
Working with the Google Charts API lately, but the group page has a really prominent misuse of "let's"
Oh, it's not easy being a grammar constable:
Grammar police punished
- They had removed an extraneous apostrophe and added a comma to the sign.
I'm not too sure about the use of "had" there - I think without it the sentence works just fine...