The venture community has started to pile into the space with Accel leading a $30mm round in Groupon and Living Social raising an additional $5mm from VCs. Rue La La was having its leg humped by PE firms as it sold out to GSI for $350mm. Several other Sites are in the process of being funded.
Thoughtful post by Todd Dagres on private sale sites. My work at CrowdSprout was a little too early to get my leg humped, I guess :-)
