List-y blog post today. Thx to John, Maddog, and other commenters at TechCrunch for some of the links.

• Pluck.com -- Very high end, high startup code ($100k), publishers only.
• Pringo.com -- IMO sounds a bit like Pringles.
• CrowdFactory
• ThePort -- another high-end white label solution
• Group Members International
• YFonGlobal

And then I'll just add a lower-end turnkey, hosted Ning-esque option

• CrowdVine

Update: added Group Members International & YFonGlobal