Flash Cards for Toddlers

Last time I played with Flashcards, we held them in our hands, then flipped them over for the answer.  Jude of course has a new and improved way!  Just stick them on your head one at a time for the information to slowly absorb through your skull and into your brain.  I think he's got something there.  Hey, I'm up to trying anything that makes life a little easier and a lot more fun!
Gotta love these kids,
Bubbie and Jude
P.S.  At what ages did you find flash cards to be most helpful for the kids?
Related Article:
Early Education Flashcards