One of my tactics is going to be using a wand of Blockade to create something to hide behind and 'disappear' (and then having enemies thinking, "Oh, he must be behind that big block of wood, where else could he be? WHAT?! Where is he? How could this be?!"), though I've been thinking that since the block of wood sticks around for 3 rounds, I could easily use it as a weapon, too. It's 2000 lbs. of wood, and I can easily carry it without breaking a sweat. There's really no comparable weapon to get the damage stats for it, so it's got to default to whatever's closest. I'm guessing Greatclub, and since items are 2 sizes smaller than the creature they're ideally suited for, and the cube is 5'x5'x5', it counts as a medium object; therefore, it would most likely deal 3d8 damage as just a giant bashing instrument.
However, if you throw it into the air or drop it from above, it does way more damage than that due to its weight. *shrug*