So maybe only travel geeks would find a fare map fun? I have a couple of times searched for a weekend away on the Southwest Airlines Getaway Finder. The map lets you enter your starting airport, dates and price range.
Voila! The locations under $236 round trip from Minn/ St Paul airport. Philly at $176 looks like a great getaway!
You can play with the map here: http://getawayfinder.southwest.com/flights?clk=GSUBNAV-AIR-MAP