Spend some time surfing this site if you want to get your mind around a 6lb base weight. And (to channel my inner Anna O'Leary here) take a look at the videos and info on this site: http://ultralightbackpackintips.blogspot.com/ It ain't hard to find a boat load of amazing information to make your backpacking experience safe, fun, comfortable...and lightweight.
The year before I found BPL I tripped with 40-50lbs on my back. My total pack weight now is under 23lbs. I personally don't care to meet the strict definition of what constitutes Ultralight, but I do think what one can learn from the impassioned here can (and does) fundamentally transform backpacking and hiking as an outdoor activity. People who enjoy "standard" or "traditional" backpacking today need to hear about it, so get reading and spread the word! :)