Oh just the typical stuff. I'm old school so... Your favourite text editor(I use vim) or you can be a bit more fancy and go with something like Netbeans or Ecl

Oh just the typical stuff. I'm old school so... Your favourite text editor(I use vim) or you can be a bit more fancy and go with something like Netbeans or Eclipse(although I always go back to an editor). And firebug for debugging. You can add a bunch of stuff to the mix, but that's all I need really. (Oh, you might also want to throw in a mini-fier for when you're done.)