I usually take about 4 rolls of 24 pictures a month. That doesn't include special occasions when I tend to take more pictures.
I send my picture to either York Photo Labs or to Photoworks.com to be developed, mostly because when I started this 4 years ago they were the only place where I could get the pictures on disk. I stay with them because someone always send me a coupon and because the pictures over the internet are cheaper than at local stores. I usually get doubles and the pictures on CD. The doubles go to family or friends who are in the pictures.