Looking for utopian or even just weirdtopian-but-positive-valency settings in fiction.
Answers that I haven't already read, that you convince me to try, that I try and enjoy, will get 100M.
Not fussed on medium, can be traditionally published fiction, webfic, comic, tv show, whatever.
I think Greg Egan's Diaspora would qualify. I've already posted a short review here. I'm not sure if this is what you have in mind for utopian fiction. Basically it's a story about post scarcity humanity.
If this does not work for you, please define utopian fiction a bit more, and I may be able to suggest something else.
Permutation City; Diaspora; Rapture of the Nerds; Utopia, LOL; The Metamorphosis of Prime Intellect; Friendship is Optimal (and other Optimalverse stories); Worth the Candle; and San Junipero all depict post-upload utopias.
(Also—for balance—Lena, but only extremist-economists / repugnant-conclusion-bullet-biters can read this as plausibly non-dystopian.)
Just Another Day in Utopia -- a short story by Stuart_Armstrong on Lesswrong. Pretty direct, succinct take on what experience in a utopian world might be like.
There's a comic by Alan Moore called Marvelman, later retitled Miracleman, that ends in a utopian thing. And Neil Gaiman wrote a follow-up which covers life in the utopia. There are things that are good about it and things that I don't like as much. But I've met other rationalists who like it.
Alan Moore's part was in the 80s, Gaiman's continuation was in the 90s, and then revived and is being further continued as we speak, I think. I like the first part of Gaiman's continuation more than this new stuff.