Is there a future for social browser startup RockMelt ? Despite attracting only a few hundred thousand active users since its much-hyped launch, the company filled with ex-Netscape rockstars and backed by former Netscape founder Marc Andreessen just managed to raise another $30 million in a B round led by Accel Partners and Khosla Ventures, with Andreessen Horowitz, Ron Conway, Bill Campbell and Josh Kopelman also participating. Jim Breyer of Accel and Vinod Khosla will be joining the board as observers. That's some pretty serious money.