A number of different sites with techniques for solving those CSS layout blues

1. glish.com : CSS layout techniques: “CSS Layout Techniques: for Fun and Profit”
2. The Layout Reservoir - BlueRobot: Please feel free to borrow, steal, abduct, and/or torture the documents contained in the Layout Reservoir. Though you need not give credit to BlueRobot.com, a comment in your source code would help other developers to find this resource. Enjoy.
3. Ruthsarian Layouts: Building CSS-based layouts can be a pain in the ass. In an attempt to save the sanity of myself and others, I offer these layouts that I've put together. Everything here is royalty-free, copyright-free, and warranty-free. Enjoy!
4. Layout-o-Matic: "We‘ve already been through the pain of making our layouts cross-browser compatible, so you don’t have to! In the spirit of the wonderfulList-o-matic, here‘s the first of InkNoise’s toys for the Web designer crowd."
5. Little Boxes: Different Layouts