As a viewer of pictures, Imagestation is the WORST! For instance, if the poster posts a direct link to one of the photo pages in a message and you click on it, instead you are taken to a page saying that you have to be a member to view that page...instead you have to look through the whole album page by page.
As well, you can't just post a link to your album, you have to send out an "invitation" from Imagestation where they have in the message...there is an option for posting a link, but it's a special link which sends the user to a special page because they aren't a member.
You can't just think about these sites from the poster's perspective...you have to try these sites first as a viewer. My favorite (as a viewer and a poster) is Pbase...I love the fact it remembers the last size I viewed pictures at.