Well, here's my first stab at a decent looking 3D graph. I think I did pretty well...

It's not as flexible as you might like in a control, but hey, you've got the sources so do what you will with it.

Basically it graphs dollar amounts over time in a 3D "ribbon" look. It will also highlight a specific day, and is double-buffered for speed and uses basic anti-aliasing for a crisp look. It's part of the next release of CheckBook Tracker. Ready for the palette and includes a palette icon. Just drop it on your form at design time. Colors are fully customizable.

http://tony.maro.net/mod.php?mod=downloads&op=showcat&id=2&level=1