I have the Guardians of Order book which has D20 stats for all of the characters from the first book, yeah.
Interestingly, the highest level characters in the game are Tywin Lannister, Maester Aemon and Syrio Forel. A friend of mine (Lord Qorgyle on these forums) figured out that according to the game mechanics, the highest level character in the universe is possibly Donal Noye as he constructed King Robert's warhammer (which is listedin the book as a +3 hammer) which requires 19 levels of Artisan. Syrio Forel only had 17 levels total.
Other interesting characters are Gregor and Sandor Clegane, the former being level 10 with levels in Knight but with a STR of 24, while the latter had 12 levels in flat Man-At-Arms but only (hah) 20 STR. I think this means that in combat, Sandor actually has a slight edge on Gregor, something I think is debateable at best and will probably be proven one way or the other by GRRM at some point.
Disclaimer: this was all from memory as I'm too lady to stand up and get the book.