My best find was this great one (picture above) Camelot Jr. It can be played with one player (or more to help) and is a strategy game using different block sizes and combinations to save the princess. The beautiful wooden pieces make it so nice to play and use.
Our other family favourites suited to pre schoolers (ie. no reading involved) are:
The aMAZEing Labyrinth
Snakes and Ladders
We are always looking for more suggestions?