The free implememtation of Logo available from Softronix is quite fabulous, not at ANY price, but certainly worth MUCH more than the nothing they charge for it.
You won't write the next killer app with it... but a fun and interesting programming learning environment which works well in schools.
"MSLogo", link below.
While you can do simple things almost immediately, don't think that turtle graphics are the limit of the language's capabilities! You can, for instance, create a "3D" wire frame representation of a building, and then re-draw it from different points of view by changing just a few numbers in one line of the program. (rec'd by tkbsch)