I have been using the same template for my blog for the past 2 and a half years. I wanted to change it but never got the time. So this weekend upgraded my blog to a new blogger template. Had quite a hard time setting up my comments since i was using comments from HaloScan. Other than that the rest of the stuff were ok and didn't require a major work when i moved to the newer template.
One issue i am having is setting up Windows live writer to use blogger labels for posts. Have been trying to set it up without luck. So now after i publish a post from Windows live writer i have to login to blogger to set the labels. Not very smart, but until i figure it out i have to stick with this.