Madrona Ventures may invest in more Internet ad start-ups now that former aQuantive CEO Brian McAndrews is on board , but it's unlikely to take much interest in agency pure plays. In a brief talk with ClickZ this morning, McAndrews said the VC firm would consider investing in startups with a services component, but he said there would have to be technology attached in some way. For instance, he said Madrona might look at an analytics firm with in-house data analysts