Included for a bit of cultural diversity:
MR2198856 (2007c:60074) 
Robinson, Thomas(1-RTG); Vijay, Sujith(1-RTG)
Dreidel lasts O(n2) spins. (English summary)
Adv. in Appl. Math. 36 (2006), no. 1, 85–94
The list of references is also worth checking as it has some more elementary accounts.