Hey All, I've documented the results of my investigation into product data standards here: http://confluence.dev.lithium.com/pages/viewpage.action?pageId=47110202.
Unfortunately it does not seem like there is a clear winner, but hopefully customer input will help drive our choice. Personally, I think that since our internal schema is likely to be a very small subset of what these standards express, that it will be feasible to support all of them out of the box and simply map the data we care about into our internal representation. Comments/Ideas are welcome (please add to confluence). Thanks, Paul