How many undeveloped domains do you have?

I was looking over my GoDaddy account and realized that I'm up to 20 domains in my stable - and only five have been developed at all. I get a new idea and run to register a name but then don't have time to do it all.

I made a resolution to not buy any more until my first 20 are developed, which I am busy working on now. The good part is that some of my domains have aged nicely so should give a bit of extra SEO boost.

How many domains do you own and how many are actually developed?