Just think this way we could actualy search for others ideia... As it is today I had to search with google to know if a ideia was already sugested or not... Like the forum has a searchbar to discovery already made questions, the same could be made here :-)
I (and others) have answered this frequently. If you click on the magnifying glass icon in the page header towards the right and enter your search term you will see a tab in the results for Ideas. Click on that and you'll see the results.
Hope this helps,
Since the number of topics I would really suggest someone is gonne take a look at the search within the idea section (-: