For Any Age
I love playing scrabble and other word games. I usually play about three games of "Words With Friends" each week. Scrabble Flash is quick and fun to play for any age. You can purchase the game for about $10.
Sifteo Cubes look like "Cublets", and similar to Scrabble Flash; however, they run about $130 for a starter kit. The whole family would enjoy these cubes.
With "Cublets", children can create robots. I am fascinated with these cubes. They are a little expensive at $150, however, they would capture a child's imagination (and parents imagination too).
I found this set on Edmund Scientific. It looks like it would provide hours of inventive fun. The $80 to purchase the kit sounds expensive; however, it provides over 20 different projects for children to create.