O'Rielly have a very interesting article on the Wayback Machine and how they built a system of 300 computers with over 100 terabytes of storage for about US$400,000. Not only that, but the parallel aspects of the system are transparent to the programmers due to their system, P2 (soon to be released as open source).

For those people who think that was all too technical, you might prefer this random selection of cute kittens.