We have a lot of ideas that got implemented or otherwise addressed but they keep showing on the portal distracting from the things that are still not addressed. I don't want to delete them because often thy contain useful comments and track of customers who requested it and it's nice to have the track of why they got done, but they clutter the current view immensely and I might just start deleting them. It would be nice to have a way to archive the ideas.
As noted in the comments below, we provide the ability to adjust the portal visibility of ideas. This allows you to keep the information in the ideas (without making it visible to your portal users).
Based on the existing functionality, we will mark this idea as Already exists.
If you want to hide some ideas from the portal you could use the Visibility setting to make them not visible in the portal.