Beginning on January 1st, 2015, Pinboard will begin charging an $11 annual fee for all new accounts. If you’ve been holding off on buying a Pinboard account, now is a great time to do so; provided you sign up before January 1st, you’ll only be charged a one-time fee of $10.55.
Pinboard is by far my favorite site for bookmarking fic; the developer is extremely responsive to fandom’s needs and even gave this awesome talk on fans and social bookmarking. There’s a fandom-only popular page, too.
More details on the change here! (And if you already have a Pinboard account, don’t worry—you won’t have to pay the annual fee, although anyone who signed up before 2015 but wants to support the service will be able to opt-in to the new pricing scheme.)