For my money, Thursday is one of the best days of the work-week.
Monday and Tuesday I find myself wallowing in the depression of the "This is really what I do?" attitude. These two days are the hardest grind of the week, because Friday seems so far away.
Wednesday is the apex of the week, or the hump if you will. You know once you get past today, it'll all be down-hill, but getting past Wednesday is the tricky part because you are equidistant from the weekend: it's three days back and three days ahead. This is the day, more than any other day that you can't remember what your life was like before you were, er, encouraged by society to go out and make a living.
Friday is a good day, because you are on the last step before freedom. However, I often find that Friday becomes overshadowed by having to consider which "restful" things I will be doing on the weekend with all of your hard earned cash. You also can't really get a whole lot of work done because you can taste the liberty sandwich that you are about to consume.
But Thursday, the world is alive. You know that you're close to the end, and so you can take a deep breathe, relax, and know that all is closer to being right with the world.
12 hours ago