John and I have been talking about building something new and fun- a 3 axis CNC mill. It's amazing where things have gone the last several years in affordable, easy to use electronics. There are literally thousands of examples on the web where people have built their own CNC machines for a very reasonable price. The neat thing about this project is that:
A) the project itself should be fun and a great learning experience
B) once built, it can be used to make all kinds of neat, high precision parts for other projects.
Personally, I think it'll be great for making custom wing cores and cutting out plywood components for aircraft.
The timing seems right, since I'm also just starting a project at work where I need to build a simple piece of test equipment which will provide me with practice directly appliable to the CNC mill.