All the current papers on GoldenGate are available on the Oracle MAA site (http://www.oracle.com/technetwork/database/features/availability/oracle-database-maa-best-practices-155386.html).
Oracle GoldenGate Performance Best Practices: http://www.oracle.com/technetwork/database/availability/maa-gg-performance-1969630.pdf
Oracle GoldenGate with RAC (this is currently being updated and the new version should be available in about 2 weeks): http://www.oracle.com/technetwork/database/features/availability/maa-goldengate-rac-2007111.pdf
Transparent Role Transitions with Oracle Data Guard and Oracle GoldenGate: http://www.oracle.com/technetwork/database/availability/ogg-adg-2422372.pdf