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Hi JMorris,
The Jerkiness in IE is caused by your semi-transparent background which scrolls over the fixed background.
This is something I have noticed on a couple of my sites as well in the past. However taking it away really loses the brilliant effect and makes the text harder to read as well.
In the past I've made visitors select the speed of their machine (fast vs. slow) and remove the semi-transparant background if they selected slow. You'll notice that on a really fast computer the jerkiness is a lot less than on slower computer. Obviously IE isn't very efficient somewhere.
you might also want to try and change the transparant .gif into a .png and see if this changes anything (they are rendered in a different way) however then you get into the whole IE - png issue.
anyway. Great theme !!!
good luck, Highlander