Architecture Question(s)

I've written a .NET Forums package that is your standard n-tier application:

UI --> CacheBroker --> BL --> DL --> Microsoft Application Block

I feel that my biggest programming weakness is lack of understanding in design patterns. I've been reading some articles and I'm thinking about implementing the MVC pattern for my UI and the Facade pattern for my business layer. Here's the thing. I dont think my business layer interface is all that overly complicated to use, so im not sure if it is even worth porting over. Thats not to say that down the road, it will not be. I'm mostly wanting to do this for learning, as well as improving my application architecture.

Comments?

http://www.amazon.com/exec/obidos/tg...76164?v=glance

I have seen a really good book on design patterns.

Design Patterns
isbn: 0-201-63361-2