I probably should have written about long ago, since I've been friends with these guys for about five years! CarloadUSA has worked out several really neat ways to post loads to their loadboard as well as others like central dispatch, 123loadboard, and more. If you have your broker authority, or have friends that do, pass this link on to them! It's a big time-saver.
And of course, if you're a driver looking for loads, you should try them out for a month or two, and see if they have loads in the lanes you run. Can't hurt, right?