Wikipedia Mobile For those who need reminding about why Memorial Day is celebrated, the free Wikipedia iPhone app gives a great history of Memorial Day. That way we know what we're celebrating on our day off! (Or in this case, remembering.)
Simple Soiree This all-in-one app allows you to keep track of guest lists, RSVPs, shopping lists, and to-dos. This will undoubtedly help you to remember everything on your list so you don't end up with 3 boxes of spoons and no forks. Disaster.
eCards Let this app handle things for you -- send an e-card that is holiday appropriate! There is also an app just for Memorial Day as well.
Grill Guide Let's face it -- Memorial Day (or any day for that matter) is a waste without a good barbecue. Throw some ribs, veggies, chicken or fruit on the grill and let this app help you make it delicious.