I just got my copy of SysAdmin Magazine and was surprised to see an
article about Usogres -- The PostgreSQL Replication Tool.
I don't remember seeing it mentioned on this or the General list. Though
I just started reading the article and don't have a firm grasp on it yet,
I do remember a discussion of replication using this technique - described
in the first two paragraphs.
Fyi,
Rod
-- "Open Source Software - Sometimes you get more than you paid for..."