In the comments for the article mentioned in my previous post, I noticed a link to a site that covers the Automotive X PRIZE, X Prize Cars. Since this site is dedicated to covering this one competition, and clearly is covering it in a lot more detail than I am (with pictures, lots more AXP articles, and comparison tables for some AXP entries), I'd recommend going there rather than here if you're interested in that specific prize.
It's great to see a dedicated site, external to the official site, for the AXP. Now if I could only find an independent site totally dedicated to the Google Lunar X PRIZE, another for the Regolith Excavation Challenge, etc ...