DS5 wants more lego's, he is in love with the creator 3-1 sets. Other things he is getting are the previously mentioned snap circuits (upgrade) and Blokus.

Have yet to try it but Animal logic (http://www.fatbraintoys.com/cart/print.cfm?parent_sku=FA035) looks like fun and I might add that depending on how the other shopping goes.

For those with younger kids that love puzzles I highly recommend Castle logix (http://www.amazon.com/Educational-Insights-2953-Castle-Logix/dp/B000NNLNW8). My son got this when he was 3 and still pulls it out from time to time.

I love the binary clock idea, DS is to young but I am certainly adding it to my list smile

Happy shopping!