How to create a resuable structure in ASP.NET 4.0 (C#)

Question

Hello,

I am looking at how I structure my projects in ASP.NET (web applications).

Most websites will have the basics but each project will differ and I will need to add some extra functionality that I would like to group into applications. E.g. add a blog application.

I am interested in web applications so that I may package websites / applications up

What are the best ways to do this?

Thanks! Dan.