Super mario galaxy, New Super Mario bros, Mario party 8 I belive its called?Oh, and COD Reflex, the Silent Hill Series, and the Conduit.
All of the Lego's Games are great for children of all ages from 4 to 54 . Find waldo is great for those kids who like hunt and search games. Mario and Sonic at the olympics will keep them entertained for hours. Squeebals is another party game for children of all ages. Silly enough for a child and twisted enough for an adult.
metroid prime trilogy
I second the Dora/Diego games. My 3yo loves em.