This is a list of well-formatted, good-designed, mostly essentials-style content for D&D 4th Edition.
It is meant first of all as a personal reference, as my "homebrew content" bookmarks folder has almost become longer than my screen height. It is also meant as a resource for any player or DM that, like me, is excited by the 'new direction going forward' and wants to see more of it.
The material here is mostly meant for people who enjoy the new Essentials direction, but E-naysayers could find some E-agnostic content, too.
Please, if you find any other interesting content leave a comment and I will add it.
Witcher - A class inspired by Andrzej Sapkowski's character, as portrayed in CDProject's recent games The Witcher and The Witcher 2.
Essentials Artificer (infuser) - Heroic tier only.
Essentials Bard (skald) - One of the best in this list, I have to say.
Soulknife - A Power Points Striker with an Essentials Format
Fighter (wrestler) - An Essentials Brawler Fighter
Radiant Avenger - Striker subclass of Paladin
The Channeler - An Essentials-Style Chaos Sorcerer
The rough side
These classes below are those I think are a bit on the rough edge, that would need some tampering with to be acceptable in play. Nonetheless, you can farm a lot of good ideas from here.
The Specialist - a very peculiar leader/controller.
Options for Existing Classes
The Hell Knight - An infernal-themed build for the Knight
Unearthed Wrecana - A collection of Wrecan's finest articles, a must read for everyone into homebrew.
Square Fireballs's Magic Item Reset - Magic items redone from the ground-up.
The Fourthcore Armory - One of the best magic item collections I have ever seen.
The Wood Sprite - a kind of pixie/fairy/wingy-thing designed to go with the Arcane Archer listed in the Class section.