Which online digital photo service do you use? And why?

I don't have a printer yet for my digital camera and I need to order prints..

Wal-mart.com

You can order print on line and pick them up in your local store.

flickr. Because it works with Yahoo! pretty well.

I use walmart...I can pick pics up at the local store in an hour, or have them sent to my friends via mail, if I choose to do so. Really convenient.