Fangraphs has his average fastball velocity this year at 90.2 and Gameday has it at 90.1. Both have him averaging around 91 mph in his last start. Fangraphs has his velocity down in this start compared to his last one. If you click on his name in the Boxscore in Gameday and then click on velocity, it will tell you that he's averaged 90.1 on his 4-seamer this year and his fastball averaged 91.9 in the first inning, 91.6 in the second inning, 90.9 in the third inning, 90.3 in the fourth inning, 90.9 in the fifth inning and 90.7 in the sixth inning of his start last night. So while he may have made progress from when he was throwing an 88-89 mph fastball, he's still not at his normal velocity nor is has his velocity improved since he came off the DL.
http://www.fangraphs.com/pitchfxo.aspx?playerid=7450&position=P&pitch=FA
http://newyork.yankees.mlb.com/mlb/gameday/index.jsp?gid=2011_07_17_nyamlb_tormlb_1&mode=box&c_id=nyy