There are multiple of these threads in various places on MR already.
If we restrict it just to the iPad (since this is the iPad forum,) then I have:
iPad 16 GB (The original.)
If we expand to all iOS devices, then I have (in my house, including the wife and kids
iPhone 8 GB (The original, purchased day one. In extremely good physical condition, I recently restored it to iPhone OS 1.1.1.) - Not used day-to-day.
iPhone 8 GB (The original, purchased by a friend on day one. When he upgraded to the 3G, he gave it to my wife. A little beat up.) - Not used day-to-day.
iPhone 3G, black 8 GB (refurb, purchased after my wife lost her original iPhone - which was found two years later. This has a cracked screen.) - Not used day-to-day.
iPhone 3G, white 16 GB (bought day one to replace my original iPhone. When I upgraded from it, my daughter started using it as a "glorified iPod touch" without cell service. We just re-activated it with cell service for her latest birthday.) My daughter's phone.
iPhone 4, black 16 GB (bought used via Craigslist,) My wife's daily phone.
iPhone 4S, white 16 GB (ordered day of release,) my daily phone.
I'm not going to expand to all iPods, and definitely not all Macs or even "all Apple devices" as suggested - as that would be well over 200 "devices" if I listed external floppy drives, mice, keyboards, etc, all separately.