I'm thinking about trying this out with my 28 month old next week:

http://www.amazon.com/gp/product/B0012F48FU/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=hellobee-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=B0012F48FU

I haven't purchased the book yet so I don't know all the details, but it seems interesting. Has anyone tried this out?