we had about 60 3750Gs deployed at one location, just 2 spares sitting in a shelf, never had to use them in 3 years. i have no idea how many there really are at my company, but I'm guessing somewhat in the range of 5000 to 10000 3750Gs and 3750s with PoE (3750G at a location with Alcatel IP phones, they don't work too good with cisco PoE so they use power bricks, and 3750s at locations with Cisco IP phones, 7940, 7941, 7960, 7961, 7965, 7970, 7975, 9951, 9971)
Seen everything from a single switch to a fully populated stack of 9 with all ports used
Seen everything from a single switch to a fully populated stack of 9 with all ports used