IBM Redbook Blog
Ingolf24 120000DRN3 Visits (1927)
Since some time there is an active IBM Redbook blog. It's called "5 Things to Know (Brought to you by IBM Redbooks)".
The bog entries describe technical details of a specific topic - usually related to an IBM Redbook.
The last blog entry described 5 things to know about HiperSockets on System z.
The blog is here.