The PopSci PPX prediction exchange organizes many socially valuable play-money prediction markets.

Popular Science – PopSci’s PPX:

Consumer Tech and Entertainment
SYMBOL NAME PRICE CHANGE % CHANGE
APPLEPC iPhone Increases Apple’s Computer Market Share 52.00 1.00 1.96
BLUBY09 Blu-ray vs. HD-DVD Format War 73.75 -0.75 -1.01
DRMRIP Major Record Labels Drop DRM 53.25 0.00 0.00
FCELL Fuel-Cell-Powered Laptop 51.00 0.00 0.00
HDVSBLU HD-DVD Sales 51.75 0.00 0.00
IPHACK iPhone Hack in First Two Months 93.50 -1.75 -1.84
IPRECAL iPhone Recall in First Three Months 13.00 -0.75 -5.45
IPSALES iPhone Sales 66.00 0.25 0.38
LCDVSPLAS LCD vs. Plasma 91.25 0.00 0.00
MACVLINUX Linux vs. OS X Market Share 47.75 0.00 0.00
MADDEN Madden Most Popular Game of 2007 58.50 0.00 0.00
NEWIPOD New Touchscreen iPod 58.50 0.00 0.00
PS3WINS PlayStation 3 Wins Console Wars 25.25 1.00 4.12
SPOREQ2 Spore Released Q2 2008 63.25 0.00 0.00
SUBPC Apple Ultraportable 45.75 0.00 0.00
TRANSF Transformers Summer Box Office 6.00 0.75 14.29
ZUNFON Zune Phone in 2007 42.75 -2.25 -5.00

Military, Aviation & Space
SYMBOL NAME PRICE CHANGE % CHANGE
A380FLIES Commercial A380 Flight in 2007 66.50 -0.50 -0.75
INDIAMN India’s Manned Mission to the Moon 62.50 1.25 2.04
ISSDONE ISS Completed by 2010 39.00 0.75 1.96
LANDR X-Prize Lunar Lander Challenge Success 58.50 0.00 0.00
ORION NASA’s Orion Capsule in Use by 2014 50.00 0.00 0.00
ROCKT Rocket Racing League Starting by 2008 21.25 0.25 1.19
SCRAMJET Scramjet Reaches Mach 15 55.50 5.50 11.00
SEGWIN Winner at the Space Elevator Games 50.00 0.00 0.00
SHUTL Four ISS Shuttle Missions in 2007 41.25 0.75 1.85
SKYDV Skydiving Altitude Record Broken 64.75 0.00 0.00
SPACEX SpaceX Falcon 1 Rocket Launch 57.50 0.00 0.00
SPCHOTL Space Hotel by 2012 40.25 0.25 0.63
V22FLY V-22 Osprey in Active Duty 61.50 0.00 0.00
V22SAFE V-22 Osprey Safe 54.00 0.00 0.00
VRGNFLTS Space Tourism Safety 57.25 0.00 0.00
VRGNGAL Virgin Galactic Launch 55.50 -0.25 -0.45

Extreme Science
SYMBOL NAME PRICE CHANGE % CHANGE
BOSON “God Particle” Discovery in the U.S. 54.00 0.00 0.00
BOTS Androids Beat Humans in Soccer 47.75 0.00 0.00
DIETDRUG OTC Diet Drug Alli Recalled? 45.25 0.00 0.00
NFLHGH NFL Allows Medical Use of HGH 44.75 0.00 0.00
SOLSTRM Solar Storms Cause Massive Blackout 37.00 0.00 0.00
STMCURE Stem Cells Cure Major Disease 86.50 0.00 0.00

Energy and the Environment
SYMBOL NAME PRICE CHANGE % CHANGE
BULBS Compact Fluorescent Lightbulbs Gain Market Share 99.25 0.00 0.00
CO2MKT U.S. Carbon Trading Law 70.75 0.00 0.00
DONGTAN Dongtan Inhabited by 2010 52.00 0.00 0.00
DRYWST Water Crisis In U.S. West 51.50 0.00 0.00
ETHNOL Ethanol’s Long-Term Future 55.00 0.00 0.00
GASTRTY China-U.S. Greenhouse-Gas Treaty 47.25 0.00 0.00
H5N1 Bird Flu in North America 49.25 0.00 0.00
HIGAS Gas Prices Hit Record High 64.25 -2.75 -4.10
HURICAN Major U.S. Hurricane in 2007 88.50 0.00 0.00
OLYMPAIR Air Pollution Postpones Olympics 52.25 -0.25 -0.48
USMPG U.S. MPG Standards Upgraded Again 60.00 -0.50 -0.83
VRGEARTH Virgin Earth Challenge 56.50 0.00 0.00

Web Trends
SYMBOL NAME PRICE CHANGE % CHANGE
DIGGRIP Legal Trouble Shuts Down Digg.com 31.25 0.00 0.00
DOWNLD Future of Video DRM 53.25 0.00 0.00
ERADIO Internet Radio’s Survival 46.00 0.50 1.10
FACEBOOK Facebook.com IPO in ’07 40.75 0.00 0.00
FIREFOX Firefox Market Share 61.25 0.00 0.00
GOOGL Google Overtakes Yahoo 99.75 0.00 0.00
GOOGOS Google OS by 2010 67.00 0.00 0.00
YOUSUE Google vs. Viacom 63.25 0.00 0.00

Automotive Tech
SYMBOL NAME PRICE CHANGE % CHANGE
CHVOLT Chevy Plug-In Hybrid Produced 61.50 0.00 0.00
FLYINGCAR Flying Car by 2025 54.75 0.25 0.46
HYBRID Hybrid Cars More Than 40 Percent of Vehicles Sold 70.50 0.00 0.00

The PopSci’s PPX and The Sim Exchange are the two best things that happened to the field of prediction markets since the arrival of Inkling Markets in 2006.