No one seems to agree. I can't look at lines w/o semi-colons so I'm in that camp. If I have to look at your code for more than 15 seconds I will put semi-colons on every line just so I don't lose my mind.
Just be aware if you don't use a semi-colon you can't start the next line with [,(,{ or some other stuff which is legal code to start a line with. The no-semi-colon camp recommends you do this:
which I believe is grounds for justifiable *****-slap.