I am looking for projects that walk you through from start to finish, specifically in .NET.
What are some that have especially increased your knowledge as a developer?
Any .NET topic is fine as long as it is a start to finish project. As far as language is concerned, c# and asp.net are preferred.
Rocky Lhotka, the creator of CSLA has a bunch of demo projects using his framework that demonstrate pretty much every .NET interface possible, WCF, webservices, ASP .NET, Silverlight, Windows Forms, WPF, etc...
There isn't a lot of hand holding for the projects but it's always interesting to poke through and learn new ways to do things.
Bill Steele, a Microsoft Developer Evangelist (I think that's his title) has done several "Soup To Nuts" webcast series. The three that I can recall (because I watched them) were C#, ASP.NET, and WPF. You should be able to Google them or find them by searching Microsoft events.
Rob Conery's MVC Storefront series is excellent. Currently at 25 parts, it walks through aspects of design, testing, and development an ecommerce application with ASP.NET MVC with C# as the backing language.
All of my developers have stayed current with the series, and have thoroughly enjoyed the content and the knowledge that Rob imparts.
you can also have a look at .NET StockTrader. it's a project from Microsoft and it showcases good code and good practices.