I was refering to code you are editing -- if you then want to install/run that code on a device where size is important, then there's all sorts of things you can do to help save bytes, even in an interpreted language. space->tabs may save some space, but converting all insignificant whitespace into single spaces is even better, and converting variable names to single characters can save a tone more.

Of course, if you're acctually editing source code on your iPod and Cell-Phone, then my point is void, and I weep for you.