previous discussion at: http://news.ycombinator.com/item?id=2445164

i can't believe replication didn't make it into your list, that should be at the top of the list. pgcluster and slony don't count because they're not built into the postgresql core source code.

Maybe because that's part of postgresql since 9.0 (async, sync replication coming with 9.1)?

Do you mean http://pgxn.org/about/ or something else?