Another little robot that would be great fun to have a play with is the Erector Spykee. For a little toy to come with so many features is great, if it were autonomous then it would be astounding :-) If it is Meccano related then I would hope we could add, remove, modify and expand the design as well. Also check out Spykee.org.
[Images of 3 of the newer Spykees from the Spykee.org site]
Here is the (rather daggy) promo vid: