I looked around a little and didn't see that anyone had posted about this yet- I noticed that on elements using the css3pie behavior, their background color was affected because of pie.
I whipped up an example of this here: http://inorganik.net/demo.html
Each demo explains what's been done with the css, and you can see how colors get distorted in internet explorer (all versions). Is this a known issue? Do I just need to change my css?
Thank you for your help!