OT: bookmark storage?

[Jill R]

I've been looking for a self-hosted tool to sync and/or store my web
bookmarks between systems and I've about come up with nothing.  So, of
everything out there (hosted, 3rd party, or otherwise) what have
people had luck or good experiences with?  I'm concerned with privacy,
cross-platform, cross-browser (mainly FF and Opera).  Not really
interested in yet another Google product.

- jill