User profile thumbnails

[Dave Briccetti]

Twitter seems to have a good approach for providing large- and  
thumbnail-size user images. When users register, Twitter takes the  
provided photo, scales it to create the thumbnail, and then stores  
both images at two different URLs. They make one of the URLs available  
via the API, and the second one’s name can be derived from the first.  
So when clients want to show a group of uniformly-scaled thumbnails,  
it’s very easy.

Might we want to use a similar approach?