I was just asked a question about a seating chart template, so I thought I would share mine. You can download it free here: String Orchestra Seating Chart
I change seating in all of my classes every 2 weeks because I don't want any students getting too comfortable in the back. I try to put strong players with those that need help and I feel this helps propels students to learn more quickly. The layout is specific to the size of my classroom (I can't fit more than 4 rows of violins and 3 rows of celli). But, if you can use it, great!