I guess I've become a troll, just subscribing to these lists to see if anyone will ever implement what I need n-ary data to do.  I don't really know how to program anything, but perhaps this comment will be welcome anyway.

There is an amazing new tool for visualizing tabular data called Circos

To see the shorter write-up that demonstrates what a cool tool this would be for SMW people, check out this blog post
It's got lots of pretty colors and does of a good job of selling this new technique.