Once upon a time it was amazing that disk storage cost a dollar a megabyte. Today I bought a disk drive that was the size of a PDA. It cost $90 for 80 gigabytes. That's 80,000 megabytes if you're paying attention.
It's a LaCie drive, USB powered, no need to carry an external power brick.
Dr. Lew Greenberg, retired director at my day job, recently told me that Moore's Law doesn't apply to disk; improvements in disk storage outpace improvements in semiconductors.
You can store an awful lot of stuff on an 80 gig drive that fits in your pocket. Expect much more corporate espionage and identity theft.