Wow, I only use IE when looking at Hotmail or for Windows updates. I've been using Firefox for over a year now and, quite frankly, wonder why I ever hesitated to change. For this reason I didn't know that there was an issue viewing it in IE.
Why the bloody blazes would IE read the CSS incorrectly? Perhaps the font color isn't supported in IE and that makes it divert to default black font?
I highly recommend opera. It's the fastest browser, the only browser with speed dial, and uses extremely low amounts of ram/hard drive space. Also, the wiki displays fine on it.