iFixit, which specializes in taking apart electronic products, has already disassembled the iPad 2. More importantly, you can see every step of their dismantling process from the pictures they've released. Even if you don't enjoy this kind of teardown process, they have uncovered a secret.
This secret is about the iPad 2's memory. This undisclosed detail by Apple has been confirmed by iFixit: the iPad 2 has 512 MB of memory.