For those of us involved in the technical side of making The Intarweb work, could someone tell us some information about the hardware, software and connectivity that makes FT what it is today?

How many servers are handling this load?
What functions have servers dedicated to them? (eg, mail servers, image servers, web/app servers, index servers, db servers, etc)
What configurations are they?
What are the disk subsystems?
What OSes are they running?
What databases?
What load balancing system is used?
Anything other info?