I don't mean travel sites and the lot, everyone foes that already. I travel a lot for my company(s) and am always looking for ways to save on my expenses!
Pack your own drinks.... When I go on a trip I pack a few bottles of water because when I get to my hotel, they are usually 1.50-2.25 each, but at the grocery store they are only .20 cents each. Most hotels have a fridge for you to put them in.
It's a small amount of money, but if you travel for 20% of the year like I do, it adds up quick!
Also, don't pay for the $9.99 Internet in your hotel room. Most lobbies have free wifi or even a business office for guest to use.