Replication in postgresql

Hi,

I'm new to this list. I'm Sagar. Our company is seriously considering using Postgresql for our storage virtualization solution. To be able to use the database, replication is must for us. At least master-single slave. Synchronous replication is preferred. I understand that there are some solutions like postgres-r, dbmirror, erserver etc., in 7.4 todo list replication related items are listed as urgent. Can you guys point me to the current state of things on replication for post 7.4 releases? Also, If I want to contribute to replication related development - how do I do that ?

One more question regarding the erserver 1.2. I understand that it is released under BSD style license. If our company wants to include erserver along with the s/w it releases, do we have to pay royalties ?

Thank you very much in advance for your time.

Regards,
Sagar.