Holy cow, I wrote a book!
Christian Buckley set forth on a grand mission:
To visit every cafeteria on Microsoft's Redmond campus.
This marathon effort went by the name
Microsoft Cafeteria Tour 2006, or for those in the know,
Those looking for off-campus dining options
can make use of
this map mashup
of restaurants which provide discounts
to Microsoft employees.
(Note: Rumored to be out of date, but still a useful starting point.)