George Clooney‘s Leatherheads (opening Friday) is tracking well at 73, 40 and 18 — it should do close to $20 million, maybe a bit more. Nim’s Island, a kid’s picture with Jodie Foster, is running at 59, 27 and 7. The Ruins is at 44, 22 and 6…doesn’t look like much. Among next weekend’s (4.11) openings, Prom Night is at 59, 28 and 5; Smart People is running at 39, 22 and 2, and Street Kings (Fox Searchlight) is at 47, 35 and 3. 4.18 openings: 88 Minutes at 42, 33 and 4, Fobidden Kingdom is at 59, 39 and 6, and Forgetting Sarah Marshall is running 47, 28 and 3.