I got the following for DD10:
Perfume Science kit
Magic Penny Magnet kit
Jishaku game
6-in-1 Solar Building kit
LEGO Harry Potter The Burrows
Soda Can Robug

I got the following for DD5:
Flipbook making kit
Quelf Jr. game
Wiki Stix
EZ Fort
Origami kit

Some existing favorites that we highly recommend:
Wedgits (we all have fun building with them)
Marble Run
The Amazing Labyrnth game
Settlers of Catan game
Magnatiles (both kids have been happily playing with them for the past hour)

I hope this helps.