ANNOUNCE: CompressedStorage http://www.zope.org/Members/tsarna/CompressedStorage This is an experimental storage that layers over another storage, compressing objects larger than a certain threshold (default 2K). You will need to know how to use custom_zodb to play with this. Since it is experimental, don't blame me (but do tell me!) if this turns your ZODB into mincemeat. Thanks to Jim Fulton for suggestions on how best to implement this.