Playoff odds by baseballprospectus:
http://www.baseballprospectus.com/st...cs/ps_odds.htm
AL West Div WC Total
Anaheim 23.4% 12.4% 35.8%
Oakland 66.9% 6.8% 73.7%
Seattle 0.0% 0.0% 0.0%
Texas 9.6% 8.2% 17.8%
Remaining strength of schedule and the performance so far are considered. It probably overrated teams that lost significant players lately, like the White Sox, and underrated teams that got significant helps half way through the season.