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Due to the way Ning handled the past development environment (opensocial), they basically alienated all the talent I knew personally. I have yet to find an API Developer I would recommend. I hope I can take the time to change that soon. Maybe an API Expert will see this post. =) Have you tried asking on the Ning Developer's site?
You are likely to find someone there, over all the Ning sites.
Keep us posted and good luck,