When it comes to the widget ecosystem, lavishly funded companies like Slide, Clearspring and RockYou hog the limelight. But it is Userplane, now a subsidiary of AOL, that seems to be revving up the money engine without much fanfare. The company that started out offering a Web-based chat system has now morphed into a many-faceted business, including owning what might just be one of the largest widget ad networks out there.

At the D6 Conference this week in Carlsbad, Calif., I ran into Userplane founder Mike Jones, who sold his company to AOL in 2006 and now works for AOL. During our conversation, I marveled at the amount of money being pumped into the widget ecosystem while at the same time fretting about the paucity of revenue opportunities. My skepticism about the sector was outlined in an earlier post that focused on Clearspring’s latest round of funding.

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