I've been frustrated with the look of this blog over the last year mostly because the old look was so stiff. I was unable to have more than two columns. I felt many of the items in the side column were so far down no one would ever see them.
Though this new design is not perfect, I do like the colors and it does give me just a little more flexibility. (It is hard to find the right shade of green to go with the logo.)
That said, don't be surprised if you see more changes in the next few weeks as I play with it and get a feel for what I like and don't like about this one. If you have suggestions, feel free to pass them along!