Looking around at the Oracle Blogosphere . it seems more and more people are blogging which mean more and more information is available for people to digest.
Kevin Closson in his post discusses the fact there is only one LGWR process in the Oracle Database.
The Logica CMG Blog has started a 11g info compaign here. This article dicusses sql replay.
Fairlie rego has a nice article about using dbx collector here.
H.Tonguç Yılmaz has pointers to a bunch of nice metalink Docs Here
and finally Paul Gallagher Host this week's Log Buffer Here.