Pinboard came on the scene at a close-enough time to Pinterest to be, I think, unfortunately named. You hear "pin it" and think Pinterest, right? I love Pinterest as much as anyone else, but Pinboard definitely deserves some attention from people who go through a lot of information and need a quick way to store, organize, and easily access it.
Pinboard is, in my mind, a nonannoying Delicious (no, I didn't look up where to put those frakking dots). It costs money, and I bashfully admit that this is why I didn't try it when it first emerged. In fact, the sooner you get an account, the cheaper it is! I've never heard of this business model before, but it's still not expensive (particularly now that Pocket busted out their super pricey pro plan...just an editorial comment).
Stay with me here because this sounds odd at first: it is a FEATURE, not a problem, that it costs money. Free things tend to go away more easily!
The Pinboard features that converted me are as follows.
It is slick and fast. It isn't pretty with graphics and pretty prettiness, so that leaves room for text and tags.
It doubles as a "read it later" service. This is vital. I've been through championing Instapaper, Read It Later, and Pocket, and they all are excellent services with good reasons to have loyal followings, but Pinboard works best for me. It smoothly integrates this use into plain old bookmarking: check a box to read later, click a link to mark as read. My Twitter client of choice, Tweetbot, integrates directly with it, and browser extensions for the desktop allow me to use a keystroke to send a site to Pinboard marked for later reading.
Sync/import from other services: if you already use Pocket, Delicious, Twitter, Readability, and/or Instapaper, Pinboard can slurp in all that data. BONUS: you can make it auto-archive your tweets for a couple accounts. Because the site is so smooth, slick, and fast, this becomes a really handy way to quickly search all your tweets.
Browser tools: extensions for desktop browsers make Pinboard even handier. I use one for Safari that has its own menubar complete with a search window and visible keyboard shortcuts. I can rock and roll, slice and dice, and get on with my day QUICKLY and know that those links will be there for me when I get time. I can simply send a site winging away for later attention or go the whole route: write a note about it, add tags, make it public or private, etc.
For a mere $25 per year, you can get everything archived. Pinboard crawls the sites you've bookmarked and offers you a cached copy, so even if the site is down or gone, your info is still there. If you, like me, do a lot of research, this is ah-maze-ing.
There is more. Check out https://pinboard.in/resources/ to see the available mobile apps, widgets, and so on.