The % key is one of the best features of vim: it lets you jump from { to }, [ to ], and so on.
However, it does not work by default with quotes ( " or ' ), probably because the opening and closing quote are the same character, making implementation more difficult.
Thinking a bit more about the problem, I'm convinced that it should be implemented, by counting if the number of preceding quotes is odd or even and jumping to the previous or next quote, accordingly.
Before I try to implement it myself, I'd just like to know if someone already has?