Talk to people involved in Second Life machinima... or art in virtual worlds in general... and ask them who they take inspiration from in-world. A few names will commonly come up. In my experience, no name gets as much mention, or as much respect surrounding its mention, as Chantal Harvey. And with good reason.
She runs her own film festival, which includes a real world Amsterdam counterpart. She now curates the 48 Hour Film Project: Machinima event.

