These were the 5-star rated ideas as of the end of July. I'll do another one at the end of August if this gets a decent number of votes (and so on, until the "Idea Of The Year"). Over time, we could build up a reference that could be fairly useful/interesting to look back at.
The Mind: Basti
The Idea: A person who issues a mission can communicate with those who've accepted it. Additionally, a squad leader channel, a platoon leader channel and a continent leader channel will exist.
The Mind: Malorn
The Idea: Mowing down infantry inflicts serious injury or death, with certain death in the case of tanks. Larger vehicles can push smaller vehicles out of the way, if not crush them completely, and vehicles traversing terrain will interact with the environment appropriately (driving over rocks, knocking down smaller trees etc.).
The Mind: CidHighwind
The Idea: PS2's landmarks are named in order to feel like you're fighting for a place of importance, rather than a characterless location on a map.
The Mind: Malorn
The Idea: Different continents are abdundant in different resources to vary gameplay and add additional tactical choices. Additionally, continents yield global resource bonuses for your empire by owning the largest percentage or majority of it.
The Mind: Tapman
The Idea: People can record Halo 3-style replays that are either entered into "Battle Of the Day/Week/Month/Year" contest, or used as footage to make videos with.
The Mind: CutterJohn
The Idea: Ambient sound effects are evidence of a battle occuring in the distance (thunderous booms and explosions for example). Additionally, during night battles there are flashes on the distant horizon in the direction of the fight.
The Mind: Malorn
The Idea: Factilies award two significant benefits - one locally and one continentally. There are an adequate number of factility-types to keep the value of these benefits high, but with no additional bonus for owning two of the same facility-type.
The Mind: Tikuto
The Idea: Out-of-game web access/portal that keeps you in touch with your character and in-game events. You can edit your skills queue, manage your outfit, observe the state of Auraxis, stay updated on live events, check the server status, manage your Planetside 2 SOE account and much, much more...
Threaded Mode