With only a few more hours until Grand Theft Auto V for PC releases, Rockstar has published an extremely helpful guide covering the Rockstar Editor and the brand new Director Mode. If you're wanting to create the next big Grand Theft Auto machinima, this is the guide for you.
On the subject of prepping, Nvidia has released a brand new driver (350.12) which brings SLI and performance tweaks specially for Grand Theft Auto V.