Open Question: TAXES Question: I live in MD, I'm moving to DE mid year and I work in PA. HELP!!!?

I currently live in Elkton, Maryland and work right over the line in Pennsylvania. Up until now, taxes have been easy because I don't have to file a PA return because the states reciprocate. However, I am moving to Delaware at the end of August and I will still be working in PA. How is this going to work come tax time? Am I going to take a major loss by having to file 3 state returns? PLEASE ADVISE!!!