747b0392__5_1___Postgres_OnLine_Journal__Microsoft_SQL_Server_2008
[Feature] Replication - haven't used much except for SQL Server so this is mostly hear-say [MySQL 5.1] Yes - including master-master (built-in) See comments below and from numerours reports a big selling point of MySQL. [PostgreSQL 8.4] Yes but from reports seems to be the least polished of the bunch, although numerours third-party options to choose from that are both free and non-free. PostgreSQL 8.5 or higher is slated to have built-in replication. Sorry guys this did not make it in. Slony is still used for replication, and many like it but find it finicky and harder to use than MySQL. [Microsoft SQL Server 2008] 
Yes - all sorts - log shipping, mirroring, snapshot, transactional and merge etc. and can even have non-SQL Server windows-based subscribers. Its still a bear to get working the way you want it and makes making structural changes difficult. Built-In
Cross Compare of PostgreSQL 8.4, SQL Server 2008, MySQL 5.1 - Postgres OnLine Journal
Microsoft SQL Server 2008