[clintonc]

My rationale for single quotes is also that JSON chose for you -- if you have JSON-formatted strings in your javascript and you use single quotes for your strings, you don't have to escape the double quotes.

[joepie91_]

I'd find it very worrying that you have JSON-formatted strings in JS code. Why would you do that, when there's also a native representation?

[phpnode]

Do you do that more or less frequently than writing strings with apostrophes?