EDIT (August, 2010): This post is imported from my old blog, which had 3 columns but as someone has asked me just recently about this, I thought I'd include it here.
Well, as you can see, I've got more widgets on this blog than I can poke a stick at, so many that I had to make my blog a 3-column blog to fit them all in. Of course, then I had to figure out how to switch to a 3-column layout without starting all over again. For anyone that needs the same information (in my search, it seemed that I came across a lot of questions asking about this but not many answers), use this article at Random Bytes.