This year, I'm trying to make sure the data for each of the books I finish is as accurate as I can make it. On LibraryThing, that usually means double-checking the dimensions, which always seem to import from Amazon wrong. I also make sure the e-books I finish don't include physical data.
Here's the stack of things I've read so far this year: taller than a tennis net, shorter than a hobbit. Last year, my stack grew to be higher than Stonehenge, but I'm pretty sure my data was way off - from what I can tell, LibraryThing usually incorrectly records Amazon's height measurements as "thickness," resulting in stacks that are far taller than they should be.