CNN article states that Toshiba has completed the smallest HD ever.
Right now, they are at 4 GB. If they increase the size to 100 GB, the next laptop designs are going to be very interesting. Not to mention the next iPod designs, the next Palms, the next cell phone, etc.
Oh, and now they are small enough to fit in yer head, so you could do the whole Johnny Mnemonic thing! I can't wait! I've wanted that job sice I first read it.