I don't think I've got a single W7 device, ironically. The last one I would've had that ran the OS I ended up downgrading to XP on so I could run things a bit more stable on it (it's an ASUS Eee PC 1005, netbook from the stone age when they made netbooks). That one is actually still in use on display in the living room running metrics for BOINC with its lovely screen saver.
At the office, I have a Windows XP and Windows 98 machine ready for random things that may pop up. Hell, I have a working IBM Model Z 286 with Windows 3.0 on its 30MB HDD...