I've just completed another round of re-working the colors and header images on this site. If you click on the different category headings (i.e. Java, Mac OS X or Open Source), you can see the other color schemes. If you like one of the category theme's better than the default one, let me know.
I also did some tweaks to get everything working in IE. What a pain in the ass that browser is. For some reason, if anything in the "main" part of the website (where the blog entries are) is too wide - IE shoves everything down the page, including the top nav bar and the right sidebar. It's so bad that a simple paragraph with "margin-left: 10px" doesn't work. With Firefox and Safari, it moves over properly and overlays the sidebar if that's what it takes. Because of this, there's a potential that wide posts in this site will make the sidebar drop to the bottom of the page. For the nav bar, I changed it to be absolutely positioned, so it should always be present.
Other IE issues include: 1) the calendar icon is a transparent .png (I'll probably have to change it to a .gif) and 2) the nav bar's "selected" items are up a pixel or two and contain a bottom border. While these are minor issues, I would like to figure out how to make IE more tolerant of item width's in the #main section. Let me know if you have any tips or tricks.