I recently read Designing for Emotion by Aarron Walter - Had some great practical advice and examples from Basecamp, Trello , Mailchimp e.t.c Great balance of theory and practical tidbits
Sketch is the ultimate optimized UI for power users - designers. Sketch can do what both Photoshop and Illustrator can do without looking bloated and 'laggy'. It's minimalist and spartan UI hides a depth of power and functionality it's like having a la Ferrari engine underneath a Minicooper