First off, I would like to start with the fact that I think Flickr is a great service, it just needs some improvements.
Advantages
- Basic account is free.
- Cool social sort-of-thing
- Lots of websites support Flickr integration
- Lots of cool features, like geotagging, what model of camera took a photo, and more of the like.
- Uses Creative Commons licensing
Disadvantages
- Only 100 megabytes a month for a free account.
- Videos are only for paying members.
- Subject to being taken down for “questionable content”.
- The developers didn’t know how to spell “Flicker”.
Really, the advantages outweigh the disadvantages(there were a lot more advantages to list, I just wanted to rant about the bad stuff:P).
Flickr really is a good service, and I think because of that, everyone should try it(100 megs per month is pretty good for a part-time blogger like myself 
).
