I use flickr and really like it. They get complaints regarding their lack of "improvements" but I really like that what changes they make are so subtle. There is also a large flickr bike culture with zillions of nice photos and good global reach. I think it's a superior product and pay for two accounts.
I recently started using dropbox. It's cool because you can upload any file format. I don't like that it tries to upload all my images.
Last edited by ftwelder; 03-09-13 at 05:27 PM.