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Use the could Luke (after two rounds of AES-256, of course)
Double encryption is barely useful. Read about the meet in the middle attack.
I think that's a misstatement; I'm fairly certain that AES works well as a composite function (with non-related keys), altho' I would personally use a second cipher for the second round. Even in the case of the 3DES MITM style attack, 3DES remained more resilient then just DES, just not 3x as effective.
For znort987, I recommend a chain of multiple ciphers for composite encryption, and unrelated random keys.