First there was ORBS and now there is ORBZ, ORBL and ORDB. We covered the first two yesterday, but Thomas Jensen has been in touch to say he has set up ORDB, standing for Open Relay Database. It should go public later today at http://ordb.org.
We look on with interest and at some point we'll try to piece together what each site stands for and what its approach is.
ORDB follows hot no the heels on ORBL, run by Michael Rawls in the US and ORBZ, run by Paul Cummins in the UK. ®