I had a 9/80 schedule for two summers, and I greatly enjoyed it. To me, once I get to 10 hours @ work per day, my productivity drops, so the 4/10 schedule could get a bit tiring. The 9/80 schedule is a great balance in providing every other Friday off. Plus, on the Fridays that I did work, the office was quieter, since others had the day off, so I was more productive. I'd imagine that the boss/environment would affect how successful such a schedule is, but I loved it, personally.

Simplistically, this psalm expresses grief and revenge by those who had been captured by the Babylonians.

(And "blessed" means "happy", not "God condones this and will bless you")

Looking into it more, though, I learned of a larger historical context (Taken from here):

"It is important to remember that the curses of Psalm 137 are not originally the psalmistâ(TM)s curses. They are the Lordâ(TM)s curses which the psalmist has made his own. The destruction of Edom was the fulfillment of prophecy, particularly the prophecy of Obadiah. In Isaiah 13:16, which was written about 200 years before Babylonâ(TM)s fall, the destruction of Babylon was prophesied in almost the exact terms used in Psalm 137. The destruction of the children who were too young to be transported into slavery was a common practice in ancient warfare. Since this cruelty was apparently practiced by the Babylonians during their campaigns of conquest against Israel, Babylon would receive from its Persian and Median conquerors the same treatment which it had inflicted on Israel (Jeremiah 50:29; 51:56). "