I would seriously consider just getting the regular case for the T1 -- the lighted case (8oz) weighs more than the device itself (5.9oz)! Regular case is better (3.3 oz) but I'm considering skipping it all together and just using some kind of sleeve.
Amazing that they could make the device so light in the first place.
If you want to check out more detail, there's
more info in the Sony store now.