Oracle has recently released a new 10g RDBMS version with the first service pack integrated: 10.1.0.3. It gives better support for SuSE and solves some installation issues.
In addition, SuSE has released a new orarun version which makes the installation process a little bit easier.
The plain RDBMS installation is the smoothest I have performed so far.

10gR2 CRS on SLES9 x86

CRS is the clusterware software of oracle and it is the base for the RAC installation.
I'm covering this in a separate document since the functionality of CRS 10gR2 are improved from 10gR1 and the API has been opened for third party and home made applications.
In this way you can clusterize your own application on the oracle cluster.
This is described in a document soon to be published (or I hope so).