Horcrux Hiding Places

[hokus7]

No: HPFGUIDX 133948

I'd love to have an ongoing discussion of where everyone thinks the 
remaining horcruxes are hidden.  I came up with one on the drive 
home from work today, that, in my opinion, makes a LOT of sense.

My friend had mentioned to me earlier that when Harry is looking for 
a place to hide his Potions text from Snape after Sectum-ing Malfoy, 
he thinks hard on needing "a place to hide his book", near the Room 
of Requirement.  My friend pointed out that, as Harry is searching 
through the massive pile of things for a place to hide the book, he 
notices the Vanishing Cabinet.  This is, of course, before we find 
out how Malfoy is using it.

Now, if Malfoy, Harry, Trelawney (empties :) ) and countless others 
used the Room of Requirement as a place to hide things, why not Tom 
Riddle?  I can imagine that if he plumbed the secrets of the castle, 
he likely knew about the room.  Heck, even though I'm not willing to 
go this far, he could've CREATED the room.

So, is it possible Voldemort has hidden a horcrux amidst all that 
junk?  Not many people know about the room, and searching through 
all of that wouldn't make it easy to find.  

For that matter, what about other places at Hogwart's?  Chamber of 
Secrets?  Slytherin common room?  JKR has said that if she could be 
in any room at Hogwarts, it'd be a room that Harry has been in but 
doesn't know the importance of it...yet.  Could that be the Room of 
Requirement, or some other room holding a Voldemort horcrux?

So many theories, WAY too much time.  Someone grab their time 
turner - 17520 turns should do it.

Hokus