Camera, remote and good glass
When shooting and finding you skys are burned out take a spot meter reading somewhere neutral in the shot, You will be able to get a better quality image.
ALWAYS SHOOT DIM........shoot your images a few e/v down, i take images a full stop and brighten them later....as above burnt out area loose there image data.... plus taking a pic at a lower e/v will give you a slightly faster shutter speed, reducing the chance of blur
Always been told to go the other way without blowing anything out of course. Underexposing and correcting in photoshop brings out a lot of noise, going the other way can help reduce it.
http://www.luminous-landscape.com/tutorials/expose-right.shtml
p.s. I've never read it all, looks rather boring...