Martijn van Welie collected some nice tipps and tricks concerning design patterns for different types of web sites from artists sites over eCommerce sites to web-based applications. In his artcles he points out the differences one needs to consider and even shows some best practices for page elements like login boxes shopping carts etc. . A very useful resource while planning a new project and a nice read in general.
Check it out at http://www.welie.com/patterns/.