Scalable Site Architecture

Hi.. In looking for what's required fo a site, I'm trying to find docs/overview/mentors to talk to/etc,... Basically, I'm considering what's required in terms of hardware/apps/functionality for each server to be able to support a site/system of ~100,000/day i'm considering: http server app server (single/multiple) db server Is there someone I can actually talk to who's actually been involved with the architecting/implemenation of this kind of structure. Any really good pointers that someone can point me to to get well versed in this area. Thanks -Bruce