Here's an odd little survey. What do you do to keep your support skills sharp?
Here's what I do to keep my skills sharp at work. At my desk, I have four work provided computers. One is a PC running windows, I've got a PowerBook G4, a G5 tower (which is being replaced with a core 2 duo iMac), and a tray load iMac running os 9.2. Between having all these platforms easily on hand, I can test fixes, maintain familiarity with each platform in which to better support it.
At home, I've got a beige g3 and an 8600/300 both running os 9, the work issued powerbook, a 500 mhz tibook, and a 500 mhz g4 cube. The cube and tibook are both running 10.3, and I have 10.2 loaded on the beige g3 as well as 9. I have to keep as sharp with as much as possible.
What do you do to keep sharp and knowledgeable so that you are prepared for whatever comes your way professionally?