For those running Windows 7 on Bootcamp on your MBAs, how much useable memory do you have? It seems different models of Mac laptops yield different numbers, so I am asking for MBAs specifically. I run Windows 7 32-bit, have 4GB RAM total, 2.16 useable. I am aware of the 4GB limitation, and of the things that eat into that number. My concern is that 1.84GB seems excessive. I've read some folks with MacBook Pros have 3GB useable, which is what I would expect to see on the MBA. How much do you have?