Bitcoin's Block Size Debate is Back (And It Might Be Worse Than Ever)
Why Weight? Bitcoin Scaling is Moving Beyond Block Size
Segregated Witness, Part 1: How a Clever Hack Could Significantly Increase Bitcoin's Potential
Segregated Witness, Part 2: Why You Should Care About a Nitty-Gritty Technical Trick
Segregated Witness, Part 3: How a Soft Fork Might Establish a Block-Size Truce (or Not)
Audiovisual:
Bitcoin Problems - Computerphile
Pieter Wuille: Segregated witness and its impact on scalability
SF Bitcoin Devs Seminar: Scaling Bitcoin to Billions of Transactions Per Day
Bitcoin Lightning Network Solve Blockchain Scalability
An inside look on scaling bitcoin