One word: Heavy Duty Shelves! Oh wait that's more than one word... I like the Gorilla Racks at Lowe's / Home Depot. I have a few in the current garage and they really hold some heavy junk.

Compressed air. I am finally running lines in my garage. I'm running a series line around the perimeter of the garage with several quick release fittings and one outside.

The biggie. My garage has a very large deficit of electricity. I'm running three dedicated circuts (one 208 and two 120) to the garage. Luckily, there's enough room and capacity in the service panel.

Finally, I'm recycling a ceiling fan from inside the house to the garage. It gets a bit warm around here during the summer...

Just some ideas.

Mike