I think the SoDel restaurants are all open and they are all very good. http://www.sodelconcepts.com/
Here in the Rehoboth/Lewes area there are so many great restaurants open. We now have a nice website about off-season deals. http://www.localsonlyblog.com/the-list/
The last time I was in Ocean City it looked like a ghost town but we found a restaurant on the boardwalk open where we had the most wonderful calamari and pizza. It is in a Howard Johnson's lobby and is called Fausto's. http://www.hjoceanfrontplaza.com/restaurant/
Ruth's Chris in Ocean City is definitely open all year. http://www.ruthschris.com/Steak-House...
nickdanger, There are several discussions on both the MidAtlantic and Baltimore/DC Boards so be sure to do a search on both.