I'm waiting for my Garmin Nuvi 250 to arrive in the mail, but in the meantime I'll probably stop by a few very local to me that I know I can find just based on descriptions and with Google Earth.
I'm not going to put out my own cache until I'm more experienced and have found a few myself, but I'm thinking....
1 - I own a garage that you can literally touch from a paved alley that's attached to a public parking lot. I could put up a (bird house) cache on the side of my garage. Would it be weird to have a cache that close to my house? It would be pretty easy, you could park less than 15 feet from the cache, get the cache (it's not in view from my house, or any other houses really, but the house is on the other side of the garage).
2 - What if it was a "secret" cache? In big enough caches I visit, I could leave a business type card with a word puzzle that would lead to a website that contains the coords for my birdhouse/garage cache?
Just kind of thinking out loud here...