Alfred is a powerful, extensible launcher and Spotlight-replacement for OS X. Pinboard is an excellent, no-nonsense online bookmarking system.
Through the use of some simple workflows, Alfred can be used to search Pinboard quickly. While this does require Alfred’s Powerpack, you probably should already be using it, as it’s awesome.
While there are some excellent workflows out there for Alfred and Pinboard out there, I really just want the ability to search the site from anywhere on OS X.