Buying one the first day it's at my local Apple store and replacing my in-house web server with it. Definitely gonna upgrade to the 1.42ghz processor version. :D
I'm curious how this will affect hosting companies... Does it make sense to buy a bunch of 1U PCs or use smaller, cheaper Mac Minis? If you're offering apache, mysql, php stuff then a mac is an easy platform to use. There may be a performance hit, but you can just distribute your customers over more machines. Increased redundancy, right? Just wondering... :)
An exciting day for Apple to be sure -- lot's of unique offerings.