Has anyone here used a RAM disk? I haven't seen any over 4 GB, but have read that if it's used as the windows drive, most everything speeds up by a huge amount, and they are cheap (sub $100), plus ram prices have dropped by 1/2 within 6 months. The drawback is that most only have a battery life of 12 hrs or so, which leads to the next question... is that 12 hours of unplugged time, or 12 hr of "off" time? You'd obviously want to ghost the OS install. Any opinions or experience? I'm also wondering if high-performance RAM makes a difference... thx.