All the NBA games on TNT are in HD. Several of the NBA games on ESPNHD are not. And who cares if the Sportscenter studio is in HD? When they actually show game clips, more often than not they are in SD. You would think they would do all games in HD, as these games are the basis of all their programming.
ABC is much the same way. Top college football games were mostly in SD on ABC this year, while Notre Dame VS Whoever was consistently in HD on NBC. I have heard that ABC and ESPN have to share equipment and they don't have enough to go around. That being the case, why add ESPN2 to the mix?