How delightful to know that others do the whole borderline-obsessive Excel spreadsheet gambit, too!
For what it's worth, here's where I stand thus far:
My list of schools has been pretty well finalized, which is a good feeling--although I have the vague worry I'm not applying to enough places.
The writers of my LORs have all been given notice that I'll be using them, but they all will want to see/give feedback on my SOP before they start drafting in earnest, so that's a bit on hold.
My writing sample, which was a research paper I did for a graduate seminar I sat in on this last spring, is in pretty good shape. I need to clean up a bunch of little errors, of course (bleh), but my main informal advisor/mentor/professor for whose class the thing was written only has two edits she'd make for applications. The first is easy; the second will involve a bunch of additional research time spent trudging through dusty German etymological monographs, so it'll take a bit more of a slog. The real trick will be editing it down; it's a perfect length for all of my schools but one, which requires writing samples of only 10-12 pages.
This morning I found myself suddenly and unexpectedly sitting down and banging out about half my SOP, although mostly in the form of a bunch of disjointed sentences, unconnected paragraphs, ledes trailing off into nothing, etc. My goal is to have a draft by mid July that doesn't make me want to vomit (a tall order, looking at what I've currently got), submit it to my English department's advisor for undergrads considering grad school, and then to my letter writers, with my grad school friends reading it at some point in there, too.
I start my GRE studying in earnest next week--which I realize is tomorrow, actually. Ugh. Pace your approach, Wyatt's Torch, I'm going the more cocktail-party knowledge route for the subject test, and won't actually be rereading much except short verse. It's flashcards and plot summaries for me!
As far as what I'm focusing on when, I'm deliberately trying to frontload the much more intellectually intensive parts of the application--the writing sample and the SOP--earlier this summer, so that during the fall semester I'll just have the tail end of my GRE studying, the CV (required for some of my schools), and the actual application-filling out minutiae left to worry about.
That being said, I've never done this before, and--like Wyatt's Torch--would be very interested in recommendations from those also starting the process and from those who've been once through the mill!