Open Design Patterns is a really interesting idea. It’s a collection of design patterns covering almost everything (or intends to do so). People can comment on the various merits of the approach, and what the benefits are.
As with any community-edited knowledge base, some of the advice and may verge into personal ‘opinion’ territory, but as Wikipedia shows, there can still be some useful nuggets in there.
If you’re on the prowl for design patterns, then this site is worth checking out.