ImageShack® is a free image hosting solution. It can be used to share pictures with friends, as well as post images on message boards and blogs. It can also be used to direct link images from your personal website or online auction. And best of all, it's completely free.

ImageVenue hosting

Resimuploading.com

http://www.hizliresim.com/

Photo Bucket

Flickr

Picasaweb.google.co.uk