So I downloaded my links from Pinboard's backup page (in XML format), knocked up a quick script to split out the tags and sort them, and then dumped it into GitHub, in case anyone else wanted to play with it.
Of the 4,320 tags I've used over 30,153 links, here are the tags that have over 500 uses:
Which reminds me - I've cut down on the new tags I create, having hit an LJ/DW limit - if I hit 4,000 tags then I break things, and I have 3,377 tags over there. So I've stopped adding new Via tags for anyone who I only get the occasional link through (sorry!) and I'm not creating tags for transient events. Although I am regretting not giving Brexit a tag (it's getting "Europe UK" instead. I don't regret not giving Trump a tag though...
(Some day, when I have absolutely nothing else to do, I may look at the DW tagging system internals and work out if they can be made indefinitely extensible. But today is not that day.)
Oh, and to answer the question from yesterday, OhForFucksSake has been used 327 times, making it about the 48th most popular tag. And if you want to really depress yourself, you can see them all here.
Original post on Dreamwidth - there are comments there.