This is why I was so excited when I found Stage32. Networking is everything. You never know when or where you'll meet that producer/writer/actor/etc that you'll do projects with until the day you die. Very exciting stuff.
By the way, does extra-work count? If so, then I was an extra in "The Life Before Her Eyes" with Evan Rachel Wood, who was in "Digging to China" with Kevin Bacon.