[petercooper]

I don't use Pinboard (yet) but I have my own system of many thousands of bookmarks, and the reason is that I can't always remember stuff.

So if I see, say, a good online tool for checking an email for spam-like features, I might bookmark that with tags of 'email', 'spam', etc. Then if in future I don't need to Google "email spam tool" and find 1001 irrelevant things, I can just search my bookmarks instead and find that it was https://spamcheck.postmarkapp.com/ (I just did this very search as I couldn't remember what that tool was called).

Pretty much every valuable tool or site I've ever seen is organized in such a way that I can bring it up on a second's notice.

I also can bring up things I once thought were neat and that I've totally forgotten about just by searching for a tag.