Replacing worn or damaged weatherstripping around exterior doors will save money on your energy bills. Take a piece of the old weather stripping with you to the home improvement store so you can easily match it.
I was originally going to buy a set of Monroe' lift supports, but after reading poor reviews on Amazon, I decided to go with StrongArm. I got them off Ebay, from seller "mrlousstuff". It was $44 free shipping, but I had to pay tax since I'm in CA.