The construction of the iPad 2 is more tightly packed and dense as revealed in a teardown of the device by iFixit. The teardown, a somewhat delicate affair due to the fragility of the components revealed the massive battery that occupies most of the internal area of the iPad 2 along with the areas in which Apple managed to save both space and weight over the first generation model.
The teardown revealed that the battery in the iPad 2 was larger but thinner than the original iPad, enabling Apple to retain the 10 hour battery life of the first model but with all the speed increases associated with the dual core A5 processor, 9x improved graphics and the doubling of the memory to 512MB.
It was also found that liberal amounts of glue had been used to attach the glass front panel making the risk of cracking the panel fairly high should users decide to dismantle their iPad 2. As such, it appears that taking apart the iPad 2, either out of curiosity or need for repair, is definitely not for the faint of heart.
The moral of the story appears to be that, if you are an average user who encounters some underserved bad luck by breaking your iPad 2, ditch your screwdriver, because the Genius Bar is your new best friend.
Screw That
Image via iFixit