Oh -- I think I misinterpreted the question -- sorry! My images are displayed online at PBase.com, Smugmug.com and Zenfolio.com. I have accounts in all three places and am very happy with each of them for different reasons. They all work for "hotlinking" to share my images on other sites such as this one, and they all present nice galleries for visitors to see my images. I don't care for Flickr -- too "Facebook-ish or "MySpace-ish" for me and that is not the way I want to present my images. Now that Aperture 2.0 has a better interface with setting up galleries on the web, I'll be experimenting with that, too.
Maybe the original poster needs to clarify exactly what it is in which he is interested: digital image editing software or digital image displaying/sharing software?