The custom types/taxonomies feature of WP 3.0 is a neat one. I can think of a few ways to use the duo: to display projects, a portfolio, or a gallery. What else can custom types and taxonomies be leveraged for?
How can you use custom types/taxonomies?
Custom types can be leverage for anything that can be repeatable. So as you said a gallery or portfolio would work very nicely. I’ve already used them on a few different projects:
Other ideas are:
The possibilities are really endless. Anything that can be seen as a collection is really what this is for.
How about a forum? Have a look at http://justintadlock.com/archives/2010/07/16/a-wordpress-forum-plugin-using-custom-post-types and a couple of other posts on taxonomies on that site. Justin wrote the Hybrid theme. He is also a core contributor.
I’m considering using it for a client who runs a tree nursery. This would allow me to logically separate blog-style news updates, pages, and trees (with per-tree galleries) with custom styles for each post type. It’ll also be nice to have type-specific taxonomies for categorizing the trees.