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Dear Ann and all,

We have, here at Nikon, also tested the nanorulers from Gattaquant with good results. 
However, their stability is a problem.

Argolight is a small French start-up also producing standard samples for confocal, and they 
are now designing a prototype for SIM. Here a link to their webpage:

http://argolight.com/

We have tested it and the sample contains many interesting features only resolvable by 
SIM. We were very happy with the sample, since it is robust, long-lasting and very stable 
(no bleaching). Please contact them for more information, and you may possibly be able to 
provide feedback to them since they are finalizing the design phase. Unfortunately, the 
sample is not commercially available yet, to my knowledge.

I hope this helps. Kind regards,
Pablo.