ESPN has a nice additional option to their MLB Standings called "Hunt for October", which outlines what each team has left in terms of home games vs away games, opponents combined W%, etc.
http://espn.go.com/mlb/huntforoctober
As of today, the Sox have 30 games left, 18 home, 12 away, with a combined opponent W% of .517. ESPN projects them to win 95 games (18-12 in final 30 games, a .600 W%).
Also as of today, the Rays have 33 games left, 14 home, 19 away, with a combined opponent W% of .504. ESPN projects them to win 92 games (18-15 in their final 33, a .545 W%).