Revising websites to be Internet Explorer compatible

I have been revising the themes on some of my websites running WordPress, starting with Paid to Blog Info, so that they will look right in Internet Explorer. The theme that I had been using on them was looking good in Firefox, but when I thought to check that theme in Internet Explorer the theme did not show up right. Really annoyed me, but I have now switched it over to a free theme by V4NY that I was able to tweak to create a good approximation of the layout that I had been wanting for my site.