What is the best site for storing photos used in blogs and online stores?

I manage a number of sites and I have lots of images that I use. I have, until now, stored these photos in my computer on my hard disk and uploaded them to the various sites when required. Now I am creating of online stores on Etsy and eBay and I think it would be simpler to store the photos on a site that would assign a URL, so the image could be reused on a number of different sites.

Here is what I have done so far, I have three possibilities that I am experimenting with: Picasa, Flickr and Box.net. Each assigns a URL so that I can reuse the asset. Who has experience doing this? Are there other suggestions for sites that have greater flexibility???

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