I wanted a change with something a little happier. This'll do for awhile.
This template came from Allie Brown. She has instructions in the right-hand sidebar of her blog for using her templates. But if you currently have a 2-column blog and want to use one of her 3-column templates, you'll need to read below and following those instructions first.
Also, I've had several comments about some people having problems switching to a three-column template for their blog. Here are some terrific instructions for doing just that: How To Switch to a 3-Column Blog.
It works. I switched back and forth between a two-column and a three-column this morning and had to use these instructions, so I know they work. But don't ask me if you have problems. I just followed the instructions and it worked. I'm stumbling in the dark like most of the rest of you and learning as I go. Good luck!