Simplification.
When I was researching, I knew nothing about saltwater, and it turns out, I had a lot to learn about freshwater. For instance, I didn't know what the cycle was (which explains why my casual freshwater tanks were failures). I didn't know that water needed to be tested. I didn't know how you got the salt in the water. I didn't know what a powerhead was. I didn't know that filters were a waste of time for saltwater. I had no idea what a protein skimmer was, or what it did.
I had no idea the cost, and the planning involved to have a successful system.
I found out most of this information by using the search feature to death, and I eventually got them answered. Now that I know what I'm doing (for the most part), I find myself skipping over some of the simple repetivie questions that some users have.
If there were a sticky that explained the most basic things, things you haven't thought about since you were first beginning, that would be tremendously helpful to beginners.
Most of those who post their concerns here are not that experienced, and do not know the "obvious" answers. You might cut down on a lot of the "this is my first tank, what do I do?" threads.