1. Shane Edelman's Racks - They have been dismantled since about 2003 as I recall, I actually bought a few pieces of my racks from Shane - My first 7505 and at least 2 Analog Simulators that I still have are pictured in Shane's Racks - Shane is an awesome inspiration. R.I.P. to his awesome well labeled lab...
Here's some Snips:
2. Scott Morris's Racks - Scott's Racks used to be more Cisco but as of this picture are a lot more Juniper. He says he uses them for hosting, remote rack rentals, and his class developments purposes so I guess he's gotten a good use of his gear over the years. Nothing like ROI.
Update: January 2011 -> RIP - It seems this lab is no more... ouch!
Here's a Snip from Network World:
3. Darby Weaver's Racks - Here's my pics so far (I'll need to update with the latest pics -still a work in progress):