Today’s funding and acquisitions news roundup from across the web:

Web Content

BookRenter raises $40M for textbook rentals (via DealsBeat)

GreenTech

Energy Efficiency Startup Transphorm Emerges From Stealth, Raises $20 Million From Google Ventures (via TechCrunch)

Phononic Devices Raises $10 Million To Turn Heat Waste Into Energy (via TechCrunch)

Mobile/Gaming

Exclusive: Grey Area Raises $2.5 Million To Turn Your City Into A Game (via TechCrunch)