One of the best ways for addon developers or fans of addon developers to get their addon some attention is to have it featured here on Addon Spotlight. If you're a developer who wants to see your addon in the spotlight or you're a friend of a developer looking to do your buddy a solid because of that thing you did in Cabo three years ago with the guy's on-again, off-again love interest, send me an email at email@example.com and tell me to feature the addon. I try to read all my email, and you'll most likely have the experience JerichoHM did.
Some time ago, I covered Skill Helper, an addon that was sent to me by its creator, JerichoHM, that made missing a skill point because of forgetting to train a thing of the past. Now, Jericho sends me another email discussing his newest addon called iLvLr, which adds new information about an item's ilevel and durability percentage to the character pane. Addons that add to the already existing user interface are some of my favorites, since I don't have to clutter up the screen with new pictures, boxes, and other crud.