A short list to start, but it will grow, some of my favourite recommended blogs, twitter and YouTube feeds

Stephen Ball

• Twitter  – @DelphiABall  – or  view locally
• YouTube – DelphiABall

InterBase

• Twitter – @InterBase – or view locally
• Web
  • http://www.interbase.com
  • http://www.embarcadero.com/products/interbase
• Videos Tutorials – http://www.embarcadero.com/products/interbase-labs

Embarcadero

• Twitter – @EmbarcaderoTech
• Community – http://community.embarcadero.com/
• YouTube – EmbarcaderoTechNet
• Blogs – http://community.embarcadero.com/blogs

Marco Cantu – Product Manager for Delphi

• Twitter – @MarcoCantu
• Blog – http://blog.marcocantu.com

David I

• Twitter – @davidi99
• Blog – http://community.embarcadero.com/index.php/blogs/blogger/listall/sipfromthefirehose

Paweł Głowocki

• Twitter – @pglowack
• Blog – http://community.embarcadero.com/index.php/blogs/blogger/listall/pawel-glowacki-embarcadero-com

Jim McKeeth

• Twitter – @JimMcKeeth
• Blog – http://delphi.org/

Matthias Eißing

• (In German)
• Twitter – @matthiaseissing
• Blog – http://community.embarcadero.com/index.php/blogs/blogger/listall/matthiaseissing