I'm not sure about a program exactly like that, but look into Memory Magic. You can get it on our project partners page with forum coupon discounts too.
I recently started using it more with my DD although we've had it for quite a while. There is a silly story feature with 10 stories and 10 cards each. You can start with #1 and work all the way up to memorizing 100 objects in a row. I believe at Tweedlewink centers their memory train is 300? They also have a memory flash 'em game where they show 10 pictures in rapid succession and then you pick the correct ones out of 20 or so.
Another excellent resource is Shen Li's blog
http://figur8.net (I believe it's Shen Li's blog anyway, forgive me if I am confusing people) She has lots of good memory and right brain activities on there.
http://www.figur8.net/index/Mandala is another good way to stimulate photographic memory. The child in this example is older than your kids but you can model this and allow them to watch you until they get the hang of it.
<![CDATA[<a href="http://www.youtube.com/v/yY_NvFfVGZY&rel=1" target="_blank">http://www.youtube.com/v/yY_NvFfVGZY&rel=1</a>]]> You can buy some mandala patterns here
http://www.rightbraineducationshop.com/products.php?id=13
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