I have the 'numbers' and 'shapes and colours' DVDs from Brainy Baby because they were given to me.
DS loves them, but he is a bit of a geek that way. I think he did learn his shapes, colours and numerals from them at around 18months. He still asks for them now (2.6) if he is tired and just wants to watch something mindless.
I find them infuriatingly American though.
Maybe try to borrow one and see if your DC likes it.