Lately, I've noticed quite a few people engaging with questions concerning design patterns and F# programming. I think this is a great endeavour. This question can be approached in a number of ways.:
In the first category, just in the last few days we've had F# examples of the Chain of responsiblity pattern, the Decorate pattern, the Observer pattern, the Strategy pattern, the State pattern, and a bunch of other examples posted under the Design Patterns tag over on F# Snippets.
In the second category, today there's an article today over on the Moirae Software blog on SOLID and its relevance to F#.
If you have more links to articles or code samples discussing these topics, please feel free to post them in the comments seciton.