The first version of a SIOC exporter for phpBB 2.0.x is now available. You can download it from DERI's subversion repository.
I've performed two test installs of the plugin at boards.co.nz and boards.com.cn.
Do let us know of any issues or comments either here or on the sioc-dev mailing list.
This resource is supported by Science Foundation Ireland under grant number SFI/02/CE1/I131 (Líon) and SFI/08/CE/I1380 (Líon 2) at the Digital Enterprise Research Institute, National University of Ireland, Galway.