It would be very nice for laptop users to have high capacity 2.5 HDDs with PATA interface available. At the moment the maximum capacity is 320 GB (no change since two years here). Since the first 2.5 HDDs with 500 GB per platter start to be available now, 1000 GB drives (with 2 platters, 9.5 mm height) should not be a problem. Older laptops that can handle 320 GB will be able to handle 1000 GB and many people - like me - are quite satisfied with older hardware they bought for a lot of money some years ago (especially true for IBM laptops). However, HDD space is always a problem.
I would like to exchange my 2.5 PATA 250 GB WD HDD against a 1000 GB model :-)