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That is a good question. This isn't an answer to the cloud question, but sagenb now has jsmol as its default 3D plotter. And you can just plain old embed links to that anywhere using the Sage cell server. Here is a very simple example: http://sagecell.sagemath.org/?z=eJwrLshILUrV0AQADokC2Q==&lang=sage
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.