If you're starting to think about gearing up for summer, this is one item that you definitely need to add to your list. I got one last summer and I think it's one of the best things I've ever bought.
There's that awkward stage when kids are too big for a stroller, but not really big enough to haul their own stuff around (or to travel without all that stuff!). With little kids, there is stuff. And it sure is nice if you don't have to carry it all!
We used this wagon every place we went last summer, and I plan to do the same this summer. It's awesome for trips to the zoo or park, picnics, or any kind of family outing. You can pile your blankets and coolers and snacks in it. We even used it for hauling luggage in and out of motel rooms on family road trips.