I know this is a thread I started myself, but I found some kind of an answer while surfing the Web.
The following link will lead you to the top pre-flop hands when playing at with 9 other players (total = 10 players). I guess the percentage must change when there are 9 or 8 or less players but the rank shouldn't.
Personnaly I va been surprised by some ranking...
First I thought the worst hand was 2 7 off suit, but it says it is 2 3 off suit.
Second, I didn't expect a hand like K 10 off suit to be so low... I mean it couls give two decent pair... But, mathematics is an exact science... Now that I know the odds, I might become a better player!
http://www.texasholdemtactics.com/pre_flop_odds.php