(Completely off-topic for the main site, just my own personal thing!)
The whole Man Utd first team fixture list is here, including friendlies, Champions' League, FA Cup and Carling Cup as well as the Premier League. It's updated hourly, so if you subscribe with your calendar of choice then you need never miss a match, and once a match is over it's updated with the score. Plus it'll automatically carry on into future seasons without you having to do anything.
If you find it useful, please drop the cost of a matchday pint in the tip jar!