RoR Folder application

Hey,

I'm wondering if there's a Rails app that displays folders in a
tree-like system to store things. Basically, something to organize
stuff.

I'm looking for something like how Firefox manages bookmarks - you know,
with all the folders and ability to drag here and there, tags
maybe...search...

In my application, I hope to have this functionality i.e. a way to
organize things nicely. and I'm hoping to save time...

if someone knows of such an app...please let me know! going through all
the coding for an organizer could be tedious...and I'd like to make this
app quickly...