What are the options for Content Distribution Networks for use with WordPress? I'd like to their objective pros and cons, their associated plugins or other ways to utilize them, their relative pricing, their appropriate customer profiles/scenarios/use-cases, projects they've been used on if you know of any, and any other relevant information.
This is a community wiki and so please provide only one CDN option per answer and please don't duplicate answers. If you have something to include regarding a CDN already listed please either edit the answer or add comments. And please vote up the solutions you recommend and/or think are most viable.
UPDATE: I found few resources on the web for WordPress+CDN so decided to list them here too: