Lots of companies will give you a leg-up for the masters, but it's going to be most valuable if it adds a dimension to your profile that isn't reflected in your BS. E.g. if you're at a school with a combined EE/CS department, try to get your MS in EE or Comp. Eng. This will give you the credentials to work in areas like embedded devices or wireless, which you might find interesting if you find web development boring.