I do enjoy reading the kids' writing (a lot), but grading almost anything has become the bane of my existence. I have over 100 as well, as many as 130 if everyone turns it in. I divide essays into piles of ten and tackle each section. Then, a brief break or reward
(I know, it's pathetic and I can't believe I'm admitting this publicly.)
Like PP, sometimes I use a short checklist of some main aspects I'm looking for and typical problems--a couple of six traits, especially organization features, a few grammar objectives. Circle the ones missing, check mark the okay ones, star excellent examples. I might even include a few general comments on the slip, such as rich detail, strong conclusion, proofread more carefully. The kinds of things I find myself writing all the time over and over. I was prompted to do this when I discovered that some students could not read my comments because I write in cursive
This is not because I am lazy
Other times I use the proofreader's marks I've taught them and circle/star wonderful features--no writing! I have them log the marks for an on-going record, which they use for proofreading the next paper and strive for improvement, such as a decrease in the number of fragments.
Sometimes I take a portion of the papers (like two periods worth) someplace else. I have graded essays in a fast food place (with a big diet coke to help the medicine go down), at Target in the food court (I was sitting in the back and discovered later I was taking up the employees break table! then went shopping when I was done), at the library. Takes away all the things I can stop and do at home or in my classroom.
As I'm passing the papers back, I stop at each desk for a second and reinforce or make a comment.
I welcome more, more, more ideas. Thx!