I use two services to host graphics for my board posts and
roc-ska.com, and both are excellent if you lack your own webspace or are on a tight budget. Each offers basic functionality for free, direct linking, HTML generation, upload tools, albums and slideshows. Here's how the rest of the features stack up:
Flickr+ tags for further organization
+ communities
+ view count
+ viewer comments
+ favorites list
+ tech details (for unedited digital camera images)
+ HTML and Flash-based badges for websites and blogs.
- photographs only
- image must be hot-linked to flickr
Photobucket+ non-photo graphics allowed
+ hot-link images to anywhere
+ BBCode generation
- organization limited to albums