Here a list of the blogs I often visit:

Of course the MAA-blogs:
Oracle MAA Blog

And also from the Oracle Community. Ping me if you want to show up here as well:
Cary Millsap
Christian Antognini
Databases at cern
Exitas blog
Flashdba
Franck Pachot
Freek D’hooge
Frits Hoogland
Gurcan Orhan
Harald van Breederode
Jan Karremans
Jason Arneil
Jonathan Lewis
Joel Goodman
Kevin Closson
Kellyn Pot’Vin-Gorman
Kiran Tailor
Klaas-Jan Jongsma
Laurent Leturgez
Mike Dietrich
Oracle Blogs
Oracle Base (Tim Hall)
OraPub
Philippe Fierens
Pythian
Tanel Poder