I think that this is a really good idea for weather and would like to share it with everyone:
Go to: http://www.wunderground.com/stickers/classic.html?query=San%20Francisco,%20California
It will be a site for putting weather on a website, but we won't do that today. Put your location into the location box, and click return. If you just click the suggestion, It will take you to the normal weather page. Now, choose one of the weather pictures. Don't forget about the 2 more pages of badges at the top. Left click (however you prefer to do that), on the one you like, and click "Copy image URL" Now, open up geektool, and create an Image geeklet, and paste the URL into it. It should show up now. Have fun picking which one you like!