Probably doesn't apply to a lot of people here but the PC version of NBA 2k12 has some nice mods.
This one adds the following historical teams. Very fun to play with Barkley. It also replaces the fake players from the legend teams with the real players.
2010-2011 Dallas Mavericks
2008-2009 Orlando Magic
2008-2009 Houston Rockets
2007-2008 Boston Celtics
2007-2008 Seattle SuperSonics
2006-2007 Phoenix Suns
2006-2007 Denver Nuggets
2005-2006 Miami Heat
2003-2004 Detroit Pistons
2003-2004 Los Angeles Lakers
2003-2004 Minnesota Timberwolves
2002-2003 San Antonio Spurs
2002-2003 Washington Wizards
2001-2002 New Jersey Nets
2000-2001 Philadelphia 76ers
1999-2000 Los Angeles Lakers
1999-2000 Portland Trailblazers
1999-2000 Indiana Pacers
1999-2000 Toronto Raptors
1998-1999 New York Knicks
1997-1998 Minnesota Timberwolves
1997-1998 Indiana Pacers
1996-1997 Detroit Pistons
1996-1997 Houston Rockets
1996-1997 Chicago Bulls
1996-1997 Charlotte Hornets
1996-1997 Miami Heat
1992-1993 New Jersey Nets
1992-1993 Phoenix Suns
1992 Dream Team
http://forums.nba-live.com/downloads.php?view=detail&df_id=2600This one adds a bunch of portraits
http://forums.nba-live.com/downloads.php?view=detail&df_id=2599