Our second bedroom is my office, but I also love spending time in the living room with my husband. I'm actually sitting next to him now as he plays Assassin's Creed 3. When I am in my office, I keep the door open so we can chat. Every so often, he'll walk in and give me random hugs, which are the best. He doesn't always understand what I'm doing, but he's made some helpful suggestions.
The rolling cart is a really good idea. I also have a shelf cleared on the bookcase for storing some pretty boxes from Michaels with craft supplies. One box holds my plastic mesh canvas projects, for example. That way I can keep some crafts out there so we can work on stuff in the same room.