It's over! I've done what I set out to. Barring anyone deleting a comment or creating a hidden post and then later unlocking it, I've made a comment on every post in my friend's list for a week. Including my own. What's more, I ensured that every reply to my own posts got a reply from me.

Some things I forgot to take into consideration when I set this challenge for myself:
-The slash fiction writers on my flist
-The fact that just because I check my flist regularly makes reading it manageable, but commenting on it is MUCH harder.
-That there are people who use LJ as a stream of consciousness, aka warren_ellis. Technically I never said about editing my flist during the week, but I cannot help but feel that would have been cheating.
-That some people who I consider friends use their LJ regularly to speak on subjects that I know very little about. It's hard to offer thought-out remarks on a regular basis, even if what they're saying is interesting!
-That some of my friends make posts in languages other than english!

Uh.. I don't really know what I was going to accomplish by doing this. But, I said I'd do it and I did it. I guess that's something.

Now someone please shake me very vigorously if I ever entertain the notion of doing it again!