Pincette is a cross-platform online document management service. The Stanza catalog is just one of its features. More information is on
http://www.pincette.biz/. Give the demo a go or have a look at the screen casts.
An architectural element of Pincette is that it supports filters in its I/O channels, for documents as well as folder, which is what the catalog feature is making use of. Soon there will be another e-book feature to employ this: integrated conversion of ODF to ePub. You will be able to copy an ODF-file to a folder that is used as a Stanza catalog. Stanza will see this file as an ePub file.
Werner.