some time ago skype released some tools for postgresql that they developed.
one of the released tools is londiste – simple replication system. it is master to multiple slaves, without cascading.
the problem with skype projects is that documentation is not as full as we expect from pg-related project. luckily dim used the londiste, and was kind enough to write some howto/manual for this project.
all i can say is: take a look at it. it looks as a very simple to use, without all features of slony, but definitely worth to take a look at.