I also swore I would never need/get a smartphone, but I'm addicted to my iPhone. I use the camera a lot - photography is a hobby of mine, and while I lug my DSLR around sometimes, I take many more photos with my phone. And I use a lot of the photography apps as well.

I also like it when I travel, to find restaurants, read the forums & my email, surf the web, get the news, listen to music, even watch an occasional movie, everything in one small little package. To me it's too small to comfortably read books. I may look at the Kindles in the future.

I have a 32GB iPhone 4 & am glad I got the larger size. About half is music, and that leaves me a decent amount of room for photos and apps. The iPhone 4S has a better quality camera and photo file sizes will be larger.

I love how easy-to-use the iPhone is. My dad got an Android-type (I think) and it's not nearly as intuitive (at least for me). I also have a blackberry for work, and hate it.