Federico Viticci, at MacStories found what could be my perfect desktop Pinboard client:

The interface is clean and minimal, with tags highlighted in light blue/green; Shiori comes in the foreground with a list of the latest 7 bookmarks from your account (by default; you can show up to 10) and you can start typing to filter results. The app is extremely fast at retrieving items, and it supports abbreviations to look into bookmark titles, URLs, and tags. According to the developer, the app can get smarter over time by learning from your “habits” (I assume it means abbreviation use and choice of results in search).

Awesome. The app feels and acts like Alfred in a way, which is just fine in my book.

—additional hat tip to Sean Korzdorfer