One of the best books I have read on any Oracle technology. Must read if you need to know practical performance tuning. Link below
Yet another look on Oracle latch performance
Unix & Oracle stories
Remarks of the programmer
The good DBA is one who learns from his mistakes, the best DBA is one who learns from other DBA's mistakes
Learn from the mistakes of others - you can never live long enough to make them all yourself...
My thoughts on Oracle
DBA's online diary