Great idea - I'm definitely going to use this.

Two suggestions: - Could you make it search through a specific users' pinboard.in bookmarks? (e.g. your own, if you have a lot)

- When you press enter/return on the 'tags' input, it doesn't submit the form, but instead adds a new tag. I think it would be more intuitive and similar to existing "tag fields" if enter/return started the search, and you used Space to move to the next tag