I have not been caching that long, so this topic may have come and gone, (a search didn't get me anything thou) but I would be interested if there could be a cache type called Private (or similar).
There are 2 things that I could see this being really useful for:
1) My wife and I are hosting a geocaching birthday party for my son on April 23. There will be 10 cache sites plus a bonus "indoor" night cache... (btw, if you are a parent looking at doing this, it's a lot of work!) It would be nice if I could post these to GC and then invite some of my sons friends to the caches, that would open the cache pages for those sites to those individuals. It could also be useful if you are running an event where you will be releasing a number of caches all at once. For instance, the PG Cachers do an annual Cache and Release event where they release 10 to 20 new caches. Once the event is over, the caches are published for the public.
2) Since my family all have seperate accounts and have started to collect Geocoins, it would be nice to have a Private cache or a "locationless" cache where we could all drop our coins and use that as a collection inventory for the whole family. All of our coins are kept in one binder that travels with us to events so it would be nice to have them listed on GC in the same manner.
Just some ideas....
Thanks for all you do to make geocaching fun for the rest of us!
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PGgeodude aka Kevin.