Hmm...Like many here, I'm very familiar with the Grt Pyramid's internal schematic, and every time I look at it, some definitive purpose seems to present itself. Not one I've ever quite been able to put my finger on, but something almost machinelike (and no I'm not necessarily agreeing with Chris Dunn or others here).
The Grand Gallery especially, is a completely illogical shape to ever be used as storage (basically a long narrow passage with 2 side ramps and a ditch in between- and if you were expecting a catastrophy, why would you place objects on a fairly steep slope, where they were prone to rolling to the bottom and breaking?), and if the Grand Gallery is just a connecting passage, why the grandeur and uneccessary height? And what's with the mysterious regular side slots, that no-ones ever reasonably explained?
Anyways, it's late, and that already became the start of a ramble, so I'll sleep on it, and consider more tomorrow ;)