Getting the most from MSDE
A perennial problem for commercial database-backed applications is how to deliver the product without requiring the client to purchase SQL Server. Traditionally the answer is to use MSDE. However, MSDE comes with licensing and performance restrictions. Microsoft has published and article on how to best work under these restrictions and how to test performance to a client can tell when they need to move up to the full SQL Server. This is a great resource!
Using MSDE in a Web Application