There is the
European Power Rankings. The latest I could find is from May...
EUROPEAN POWER RANKINGS
1. (2) Barcelona - 22.19
2. (1) Manchester United - 22.18
3. (3) Real Madrid - 21.38
4. (4) Internazionale - 20.79
5. (5) Bordeaux - 20.08
6. (6 ) Benfica - 20.07
7. (7) Chelsea - 20.07
8. (8) Porto - 19.58
9. (9) PSV Eindhoven - 18.82
10. (10) Bayern - 18.43
11. (11) Arsenal - 18.37
12. (12) Fiorentina -17.43
13. (13) Shakhtar - 17.27
14. (14) Ajax - 17.25
15. (15) Anderlecht - 17.06
16. (18) Sevilla - 17.04
17. (16) Roma - 17.03
18. (20) Salzburg - 16.89
19. (17) Twente - 16.88
20 (21 Lyon - 16.86
33. (33) Liverpool - 14.50
35. (36) Everton - 14.03
39. (35) Fulham - 13.52
HOW IT WORKS
Scores are based on points per game in domestic league, Champions League and Europa League games.
Domestic points per game are multiplied by the league coefficient - either 3.5, 4, 4.5 or 5 - with teams in stronger leagues getting more credit.
League coefficients:
5 - England, Italy, Spain.
4.5 - Germany, France, Portugal, Netherlands, Russia.
4 - Belgium, Greece, Poland, Turkey, Ukraine, Scotland, Romania.
3.5 - Cyprus, Switzerland, Israel, Denmark, Austria.
Champions League victories are counted as three points for a win. They are all multiplied by a coefficient of 5. Matches in the group stage and beyond are counted.
Europa League victories are counted as three points for a win. They are all multiplied by a coefficient of 4. Matches in the group stage and beyond are counted.
All teams relegated from Champions League to Europa League have had their formulas adjusted to reflect the amount they have gained or lost in Europe since then.
Example: Barcelona
99 points from 38 Premier League games = 2.61 (2.6053) points per game
Multiplied by league coefficient of 5 - 2.61 x 5 = 13.03 (13.0263)
22 points from 12 Champions League game = 1.83 (1.8333) points per game.
Multiplied by Champions League coefficient of five - 1.83 x 5 = 9.17 (9.1667)
Total score = 13.03 + 9.17 = 22.19 (22.1930)
Source:
http://uk.eurosport.yahoo.com/18052010/58/champions-league-power-rankings-barca-champions.html