This thread's a really good idea, and I fullt support helping getting good un noticed hacks well... noticed! The hacks I really pay attention to aren't the generic types "You're a Pokemon trainer so go and get badges and beat the elite four" thing. I like hacks that have an overall unique theme, ideas, and features driving the hack away from a typical Pokemon game.
Although, some of these hacks with brilliant areas are ignored in favor for a generic one. This brings trouble too, since anyone can promise anything, but that doesn't mean they can actually put it in the game. When people make hacks, before posting a feature or a new direction for a hack, actually put it in, and show off screenshots to help demonstrate what you're talking about. Don't say "I'll do it later", post the information when you've actually done some work on it.
I agree with the top post too, you shouldn't stop working on a hack just because it's not popular. The more your work on your hack, the more it will get noticed, and the more popular you will get. The authors who have made completed hacks, and hacks with a very large chunk of the game done, are the most popular hackers on this site. If you give up because your first hacks weren't popular, you wont have gained the popularity. Even if you don't get as popular by doing your best and pushing the boundaries of what a hack can offer, you should make the hack for those who enjoy it, not beg for other people to like it.