New York internet services company Agency.com is buying again. It has acquired Interactive Solutions, which will result in an Agency.com almost doubling in size. The terms were not disclosed. Omnicom Group Inc, the company that owns 40% of Agency.com owned the same amount of Boston-based Interactive, and so will retain 40% of the enlarged company. It will have revenues of about $60m and about 375 employees and is looking to recruit more. President and CEO of Interactive, Chris Butler becomes Agency’s chairman while Chan Suh retains his CEO position at Agency.com. Interactive Solutions becomes Agency.com’s Boston office. Last week Agency.com acquired the UK’s Online Magic, a web site design shop.