Stefan, glad to hear you're interested in this.
Starting a Google Code project for your Zotero translation plugin would
be good. Once you do so, please create a page about it using the
and add it to http://www.zotero.org/support/kb/tei . Stuart Yeates
already has access, so he can do it for you.
As Piotr indicated, I currently have an intern who is migrating
with an eye toward periodically exporting from Zotero into TEI format
(probably using http://wiki.tei-c.org/index.php/ZoteroToTEI ) and
I will forward this thread on TEI-L to Joel Kalvesmaki, who originally
suggested moving the bibliography to Zotero and who is interested in
promoting the TEI-Zotero interface.