How much do various things weigh?

One of the things I wish is that iFixit would weigh parts of the iPad when they break them down. I know for example that the new iPad has a 70% larger battery. But how much does it weigh? Did Apple have to make the aluminum frame on the iPad 3 thinner in order to compensate (e.g. how much does the new iPad 3 alumninum frame weigh?). It would be useful in understanding the trade-offs Apple has made in manufacturing the device.

But perhaps I missed the details and they're posted someplace.