A few days ago I wrote a summary of what you get with Oracle Linux. Because there are so many things, I forgot a few... and this is just a continuation of that previous entry.
There are 2 more features that I wanted to present :
DBSFC is a very cool feature that's available for both Oracle Solaris and Oracle Linux customers with the 11gR2 database. In summary, it allows you to basically extend the Oracle Buffer Cache in memory (SGA) using secondary flash based storage.