I've been looking for a solution to this for a while with no luck. I tried some tinted plastic covers from Office Depot (here are some pictures ). It help tremendously with glare, but also block out much of the brightness and crispness of the display. Some have recommended going to a photo store and getting some polarizing film, which I have not yet tried.
Let us know if you come up with a solution, because many people have complained about this.