Paschal has a cool post on some CSS layout generators out on the web today. I've been getting into CSS more lately for a site template I've been working on in my free time (which unfortunately hasn't been much lately), and one of the things I'm always looking for is good samples to steal/borrow. These look like good resources to bookmark.
Speaking of CSS, you might also want to check out these new ASP.NET 2.0 UI Design Templates that are now available for free download and re-use from Microsoft. They provide clean, professional looking, UI templates built using CSS, Master Pages and Themes/Skins (each template ships with several skins and CSS files you can choose from). The person who built them also added the appropriate CSS tips/tricks/hacks to make sure they look great in all modern browsers (if you read through the CSS you can learn a few good tricks). You can re-use all of the content and code in these templates for your own applications free of charge with no license restrictions.
Hope this helps,