"None of us suddenly becomes something overnight. The preparations have been in the making for a lifetime.- Gail Goodwin
Acting Coach Blogs
Lesly Kahn & Company, Actor Training 
Doug Warhit's Acting Blog 
Beverly Hills Playhouse: The Study & Pursuit of Acting
Amy Lyndon: The Lyndon Technique 
Paul Kampf: The Right to Act 

Casting Director & Rep Blogs
The Actors Voice
The Casting Corner
Film Industry Bloggers: The Manager
Film Industry Bloggers: The Casting Director 
Casting In The City
Hello Miss Jean
Casting Workbook

Blogs & Podcasts for acting
Daily Actor
Inside Acting Podcast
London Actors' Hub
The Actors Network Blog
Your Guardian Actor
Everything Acting Podcast
The Actors Voice
The Actors Voice: POV
Bite Size Business for Actors

Screenwriting & Other Industry Blogs
Shadow & Act
Deadline Hollywood Daily
By Ken Levine
Kid In The Front Row
I find your lack of faith disturbing- Another Screenwriter Blog
The Artful Writer
Entertainment Law Resources Blog