A site of immediate interest to entertainment addicts,Guru, maintained by Clifton, N.J., resident Gitesh Pandya, crunches and analyzes movie box office grosses. The database goes back to 1989, yet as stat-happy as the site is, there?s not quite enough perspective. The telltale per-screen averages?helpful in drawing apples-to-apples comparisons between films?aren?t included in the weekly report; they are in the seasonal overview, but by then they?re far less relevant. And the historical charts are just that: numbers and no interpretation. A good start, nonetheless.