I documented the building of my house a few years ago and have step-by-step pictures and notes on my web site:
http://www.lastdot.net/ I list all the options we bought (including post-building comments on the options), notes at several key phases, things they did wrong, things we didn't catch in time, etc.
One step I'm very happy we took was to take hi-resolution photos of each wall prior to the dry wall being put up. I've been able to reference back to these photos many times over the year to determine where wires and cross-studs are when making upgrades. I hot-linked the photos to a map of the floorplan (also on the web site).
Anyway, check it out. Maybe it'll save you some headaches later or give you some ideas in advance.