This site had some great seating arrangement ideas for tough classes. As a TTOC you likely don't have to worry about this as much, however, there are some classes where students choose their seats. As a new teacher in a class or a temporary assignment, creating classroom seating arrangements will take some time to master. As you get to know the students and the room you may change it often. I like to change it up and always consider a number of factors.
What this site does is showcase not only various desk arrangements, but also where to place chatty friends, ADD students, unmotivated students, disruptive students and so on.