Ohio State University has integrated Google Maps to create a fantastic interactive campus map. A "building filter" lets you toggle the types of amenities and facilities you wish to view on the map. A neat feature is the ability to run a building search, then display it on the map. It works AJAX-style without the page reloading. For an example of this try a search using "Ohio Stadium (ST) (#82)" The search will even auto-complete with the building number which is handy. This is a great mashup for OSU students, faculty and visitors to the campus.
For other Google Campus Maps take a look here..