been at my SP2010 -> SP2013 migration customer and also did a SQL Server 2008 R2 cluster installation & config
- SharePoint 2013 Performance WhitePaper
download it here for free - Yammer Analytics with PowerBI and Excel
Excellent Blogpost and free code to download from my colleague Richard diZerega - Custom Claims Provider in SP2013
Steve Peschka explains custom claims provider, URI parameters and entity types - Ofice365 Podcast with Christophe Fiessinger
listen here what Enterprise Social Product Marketing Manager C.Fiessinger from Microsoft has to tell - 28 data protection authorities in EU approve Microsoft`s cloud commitments
Blogpost from Brad Smith, EVP Legal & Corp Affairs - Microsoft Documents
SharePoint Composite Handbook
Optimize SharePoint Websites for Search Engines
Evaluate Social Business needs for SP2013
PS: Don't forget to vote for the TOP 25 European SharePoint Influencers!