I've created a Shockwave version of Pitfall for a college project. It's mostly done, except for the high score system. You can find it at www.langleycreations.com/pitfall
However, I've heard that the underground tunnels connect together and provide "warps" to different areas in the jungle. Does anyone have any information on this? Please e-mail me if you do at andrew@langleycreations.com