You don't need a board for D & D. Lots of people just make their own maps with pen and paper, due to what the Dungeon master tells them, or they just imagine the surroundings, which could be alot more fun, but difficult.
i say 90% of D&D is the interaction of words with friends... the laughter and being able to have real conversations... video games have NPC with pre-determined conversations, and you must select what you say. Here you can just say what ever you want, how ever you want. When you go to attack, its all based on dice, your chance to hit which can be put on computer. The main thing that makes D&D pen&paper so much better than video games is its not limited to the programming... its what you make it. I mean, one campaign i was DMing my friends and they were going around buying hookers, and starting fights in bars... nothing to do with the campaign but it just made us laugh.... you cant do that in a video game unless the game already programmed it in there.
SO basically, what you need is a chat room with a whiteboard feature separate for each person, a dice machine, a notebook (can also be on the computer) and a chat area where the Dungeon Master tells you what to do and you talk to people?