I am already planning what to take for our trip in Dec. Here is a great thread that will help with games and keeping the kids OCCUPIED. I think everything Dolly posted was free:
http://www.disboards.com/showthread.php?t=2191711
Just in case you need more Disney advice, Dolly wrote it all done. (She is amazing!)
http://www.disboards.com/showthread.php?t=2179996
If you haven't gone to the Creative DISign thread, I must first warn you this will change the way you vacation and is HIGHLY addictive!! I don't kinow what it is?

There is just something about seeing your kids name next to a Disney character!
I will now be making matching shirts, printing personalized sippie cup labels, printing personalized journals for my DD2 and DD3 which is mainly MK coloring pages, as well as printing M&M tube wrappers for the girls pressed penny collection. FYI-the smaller M&M tubes are better because the larger ones get to heavy with all the coins. As many of you know, 1 pound in the morning feels like a thousand by the end of a park day. I stack in the tubes 2 quarters and a penny (from 1982 or older - less zinc hence no silver smear), repeat a few times.
For the park I always pack the penny tubes in a baggie, autograph books (also in ziploc bag for easy finding), and $1 rain ponchos from Wal-Mart/Target, some snacks and a few water bottles plus the basic diaper bag supplies. It is easier for us to have one back pack so when we get to places where we have to leave the stroller

, we can just take the back pack, kids and we are off. Bottomline, the less the pack mule has to carry the better. Baby swap is also a great option.
Yes, the Creative DISign forum has the info for the window cling-ons.