<A target="_blank" href="http://www.andypedisich.com/blogs/andysblog.nsf/dx/new-corrected-version-of-domino-attachment-and-object-store-estimator.htm">Andy Pedisich provides some output</A> from one of his servers, showing how much space his system might "recover" when implementing Domino Attachment and Object Service. He also provides a link to the corrected version of the estimator.