...do some searches on "lambdagrid" or "lambda grid"....web services will only be a small part of what is coming in grid technologies (18 months out or so).
There is a decent article about some of this in the journal COMMUNICATIONS OF THE ACM, November 2003 issue. No online link unless ya' gots a membership, but I've got hard copy iff'n you want electro-ink.
One intriguing part of coming grid technologies is the idea of constructing a data warehouse on the fly (in the network while in transit) rather than leveraging disk for same. Could be hype o' the day as usual, but still interesting to ponder.
My $0.02,
Slugbug