Best Tools for Machinima?

wrinkledshirt asks: "As a former Creative Writing major with a huge interest in film, I've been thinking about trying to get into Machinima (com, org, and wiki sites -- basically, using game engines to make movies). Probably the most famous use of it for the Slashdot crowd right now is Red vs Blue, which makes use of Halo, but up until recently, most of the other options have involved FPS game engines, which would require a huge investment in time so as to create non-FPS-genre content for non-FPS-genre movies. Now that Sims 2 is here with its video-recording feature (and the promise of more contemporary realism in the expansion packs) and with Pete Molnyeux's The Movies coming out in 2005, is it possible that an amateur writer could make the Machinimatic movies of his or her dreams? Plus, what would the best tools be? What machine would you need? Would any single game engine help you create your own Citizen Kane?"