Well, in my case it's actually 9 individual islands lumped together under one name--
7 of them are spread out on (4)1133 MHz duallies with a gig of RAM, and then I have a pair of 800 MHz boxes as well. They are all on 24/7 connections.They are on a mix of Win2K and WinXP; except for one of the 800's which is up on Linux.
One question for you -- are you calling for the Server Virtual Machine in your Island script?
It apparently runs a good deal quicker if you do-- see here for the gory details.