Stickers!!!
Also, I will totally confess to being a bad mom and "plugging" them in. (You're welcome!

) I got the Disney Mix Max player (at overstock.com for about $40) and I used some software on my computer to "shrink" movies down and put on there. It is a bit of a pain, and takes awhile to do ( I start a video before I go to bed and let is run) but once it is done it is done. I can put 4 full length movies and ENDLESS half hour shows on a 2G SD card. The little thing runs 8 hours on a single charge and holds the charge for weeks if unused. That little sucker and a pair of headphones lives in my purse for emergencies, dr appts, older kid school programs, etc. If you have an iphone or ipod touch you can do the same thing much easier, but it is nice for them to have their own device!