3.1 post formats and specific categories/custom taxonomies

“Post Format” is simply a custom taxonomy, and it is – by design – not extensible.

I would recommend just implementing this procedurally, by only using specific tags with specific Post Formats.

EDIT

I would start with the Codex entry on Post Formats.

Here’s a little primer I wrote on using Post Formats as a taxonomy.

As for tutorials for implementing Post Formats, there are several. Just try a Google search for “WordPress Post Formats”.

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