My wife's family have been featured in the current series of 'Who do you think you are'. She shares a common ancestor with Greg Wallace (I think that was his name, the bloke from Masterchef anyway). Her family come from a village called High Bickington in Devon, and one of Wallace's ancestors...
I haven't done any ancestral research myself, but I know I'm a direct descendent of Rob Roy Macgregor. My dad did a bit and was quite chuffed to confirm the fact (he'd often been told it when he was younger).