As a mother of twins, I tend to frequent blogs by other parents of multiples. One of the one I read is a fairly new blog called Letters to My Daughters. Shawn has young twins and she had a great post the other day about hacks for parents of multiples.
She has tips on getting into and out of the car, going up and down stairs and how to deal with busy parking lots.
To this I would like to add my own parking lot tip (and this works for parents with one small child too). If you park by a cart return you can put one child directly into a cart and then you roll the cart around to the other side of the car to pick up the second (and third and fourth if applicable) kid. This is especially valuable if your children are mobile. My twins are three and I still do this so they don't make a run for it.
(Psst. Don't forget to check out our new twin mom Baby Squared on Babble.)