Hizook has a great analysis of VC funding for robotics companies in 2011. There isn't as much of it as you might expect (note that only one is for a UAV company, Helen Greiner's CyPhy Works, which has yet to release a product). Here's his explanation for why:
My hope is that robotics will get more love in the next year(s), but getting VC funding for robotics is a decidedly tough nut to crack. Robotics companies have large capital requirements for robot hardware, few potential acquirers, and almost no "Google-scale" breakout success stories (ie. IPOs). I mean, c'mon... one of the best known robotics companies, iRobot, has a market cap of just $700 Million. This makes robotics a difficult sell to your typical VC firm. My hope is that this list can give others courage to pursue "swing for the fences" type projects along with a source for robotics-friendly VC firms.