The current plan is to build a workshop in the back right and back middle stalls. It will include workbench space, table saw, band saw, and a radial arm saw. I'll also have an area setup for woodcarving, both hand and power carving. The rest of the shed will be used for shelves, hanging tools, and keeping things dry.
Since the shed is higher than most of our property we plan to catch the rain water and use gravity to water the yard and other plants. I found a gentleman on Craigslist who was selling 275 gallon rain barrels pretty cheaply and was able to pick one up yesterday. I like the fact that the shed can be very multi-purpose including catching the rain off the top.