[Zope] Best way to order objects in folder?

What is the best way to specify an order to objects? It always seems to come down to making a token/list property with object ids. But this is annoying since I have to change two places if the id changes... and it breaks the site if I forget. Maybe a folder which assigns #s to its objects and allows re-arranging? Any people doing similar stuff? Any ideas? Thanks, Alex. 1010011010 0 Digital Garage 1 Alex Schonfeld 0 alex@garage.co.jp - pear 1 090-4429-2323