M-F, I ride from my house. On weekends, I'll indulge in a drive out to the country (or to downtown Atlanta, when riding with my urban friends). I've created some great rides on secondary roads near my house, with just a few major street crossings.

I've noticed that older neighborhoods (50's-70's) are more likely to connect streets, while newer neighborhoods tend to be single-entrance (or worse, gated). I wish our zoning laws recognized the need for more "bike-through" neighborhoods. Speed humps are a great way to keep cars from cutting through, and they're fun to fly over on a bike.