I'm familiar with the idea of choosing one question as an (informal) "canonical" target for duplicates, but I was surprised to find that for questions about the difference between "can" vs. "may", the "canonical" question is apparently "Can/may/will you help me with this?"
As waiwai933♦'s answer points out, "May you help me with this?" is a strange sentence that wouldn't often be heard.
I would expect the main dupe target for can/may questions to deal with a normal example like "Can/may I do this?", not an odd example like this. I don't think the answers to this question are useful enough to warrant closing a bunch of a other questions as a duplicate of this one. Can it be changed? I have voted to reopen Difference between "can" and "may", which has an answer by J.R. that cites the NOAD. I think for most site visitors who are looking for information about the use of "can" vs. "may", J.R.'s answer there is more likely to be helpful than the answers to the question about "Can/may/will you help me with this?"