OK, it's now Dec 28, 2006. On eBay, brand new 500gb drives retail for 179.99, therefore $179.99/476815MB = $0.00037, or about 60.5% of what you paid on May 18th, 2006. Assuming this was the day you bought it (close enough), then the cost of memory (and likely nearly all electronic technology) is dropping at about (1-0.605)/224 days, or 0.176% per day, and is, of course, accelerating. So, at the start of 2007, tech costs are plummeting at ~1% every 5.67 days, or 1.23%/week, or 64%/year. My guess is that by year-end 2007, it'll be 0.5%/day.