I bought few of these about a month back. They are much lighter than the normal Arduino board due to the use of the small USB 2.0 header and surface mount chips. I'll weight both and post, but if you are looking to build a mikroquad, or anything where weight is an issue and you don't happen to be using the ArduPilot (which is already really optimized for size!) this is a good alternative. Oh, did I mention it adds two ADC pins to the normal arduino configuration? Really nice if you want to add a barometric altimeter to your mikroquad! Now I just need to find a shield that supports the extra pins.http://www.seeedstudio.com/blog/?p=44
The mikroquad design uses the protoshield to mount the gyro/accel board, that's why I'm interesting in using it. I'd be interesting in getting the weight of all 4 boards and putting them up here for folks. I don't know why the dimensions don't include this, but we can just post it here.
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Arduino Diecimila - 30g, approx 1oz
Basic Stamp BS2 - 1gr
http://www.sparkfun.com/commerce/product_info.php?products_id=8991