I was fortunate last fall to attend a week long training class by the amazing Mr. Todd Baginski that showed off the AdventureWorks Travel Site sample. This is a fantastic sample that shows various extensibility points needed to build SharePoint on the web sites. Even more, the MSSharePointDeveloper.com site is now updated with new training modules to help you walk through and see how much of Adventure-Works was built!
The new SharePoint On The Web modules cover the following topics:
There is a lot of material on MSSharePointDeveloper.com, including the videos from the training session. There are also webcasts that we hosted this past winter focused on this material, presented by some of the top SharePoint MVPs. I highly recommend checking out these webcasts, the MVPs did an amazing job on them.