I'm working on a project that will be included in a white paper, and needed to use SQL Server Express 2005 as a database engine. Being the "ClickOnce guy" on the Windows Forms doc team, I immediately wondered: How will I deploy this once it's ready?

Fortunately, Robert Walters already answered that question for me with his article, Embedding SQL Server Express into Custom Applications. Go give it a read if you're facing a similar need with your Windows Forms app.