Here is my weird list. We are slowly finishing ours out and the following has been very useful. Not sure how many you can get from OSH:
1. Large rolling bench, ideally with storage underneath. This was a leftover from the previous owner and it is awesome to be able to roll the tools and bench right next to where you work. We learned that we absolutely do not want any fixed counter tops or benches in the main hangar. With two planes in there and other things to be able to move the flat surfaces is awesome. In the end when it is finished out we are going to buy (or build) two of these.
2. Quiet air compressor. A hand crank hose reel and 50ft of the green flexzilla hose. The flexzilla is great if you have a hose reel. If you plan to wind it up in a loop around the air compressor you will hate it.
3. 50ft retractable extension cord
4. Small white board. We also have our MX and AD's listed on it so one quick look before we do pre-flight.
5. That rubber channel stuff to place a cords in. I run the Battery minder cord and one extra extension cord thru it so no one trips over it.
6. As many LED lights as you can get away with.
7. A large 10 or 12 quart oil jugs with large mouth screw top and handle to hold a single oil change with no spills
8. Small jack. I have used it to lift for tires and hang weights for pulling down the tail.
9. Rolling plastic garbage can. More useful for the construction work.
10. One of those oil drip pans you get at a car parts store for like $11.
11. Small NEMA electrical box with our Verizon Hotspot to give us internet for pulling wx, remote tannis starter and security cameras.
12. Craigslist special Yamaha receiver and cheap ipod like music player.
When it is finished we will add:
1. Our old fridge
2. Our old microwave
3. Barstool height chairs to go under the rolling benches
4. Some place to hold the large water jugs to work in the fridge for ice and drinking
5. 20ft movie screen and kick ass projector
6. Clock set to airport time (runs about 46min late according to my wife).