The persistence of Marginalia's creator is impressive.
I run a web search comparison site (Gnod Search) and every time I saw Marginalia, I played around with it for a while and thought "What is this for? Does anybody actually use this?" and decided against adding it to Gnod Search. Thinking this project would soon give up in the face of the giant competitors it has.
But it kept coming up over and over again :)
Then recently I was looking for blog posts about experiences with Linux on tablets. I had a hard time finding something with Google & Co. I remembered that this could be a good use-case for Marginalia. I tried it, and indeed I found some relevant posts by Linux enthusiasts.
I then immediately added it to the default search engines: