my 2yo dd has just discovered Duplo and is loving it! The best part is that her 4 yo sister is enjoying it too so I can see a few years worth of use.

She also loves the fisher price little people, puzzles, playing kitchens, cars, trains, books and dolls. I guess the theme is simple construction, make believe story props and/or playing out being just like mum and dad.

The good thing about Duplo or little people is that even if you have a bit, more never goes astray as you can just build your set.