My buddy's company is welovetowork.net. They do gutter cleaning as well as plenty of other things. Not sure how far out they go but I am sure Howard county isn't to far.
Just had these guys do all new gutters and covers, very happy, used to have to climb a ladder during a thunderstorm to unclog gutters, no more. The Bulldog system they put on has worked very well. They were also the lowest estimate. http://www.whitecontractinginc.net