FeedBurner, the RSS tracking service used by many sites, including MarketingVOX, announced it won $7 million in second round venture financing. Mobius Venture Capital led the round that included Sutter Hill Ventures as well as previous FeedBurner investors Portage Venture Partners and Draper Fisher Jurvetson. FeedBurner said it now manages 40,000 RSS feeds. It also intimated it has a bunch of interesting deals and partnerships that should soon break. FeedBurner's tracking is currently free, although it said in its release that it plans to charge for premium services.