Austrailia's are good, but Salt Lake's
Powder, Copper, and
Coal are still my favorites. A nice play off the mining industry. When I picked up a Copper keychain during the games, it came with an explanatory tag. On the tag was the mascot logo -- a box divided into four segments each a different color: red, blue, yellow, white. Weeks later I happened to turn the logo on its corner and realized it was a reactivity/hazmat chart! I have to applaud the person who thought that up.