Here are [growing] links to GDC 2015 slides/presentations:

Update: GDC Vault for GDC 2015 is now up! 

Programming Track

Tutorials / Bootcamps

AI Summit (Link)

Microsoft Sessions

Intel Sessions (Link)

AMD (Link)

NVIDIA DirectX Day

Paradox Engine

Amazon Developer Day

GDC2015 Video Links

Other GDC 2015 Collections