as always LP is helpful and well worth the money. maps are good, highlights are useful and great suggestions(food, drinks, hikes...)! it gets you excited about heading out to the pacific northwest as well...
the only negatives are (off the top of my head) the prices for accommodation, you'd be much better off booking through a discount site on the internet, with the exception of camping or staying in hostels... the only other thing (just personally) is i'd like more pictures. photographers send in thousands of pic's constantly hoping to get into the lonely planet (without pay!). that's it though...
anyway, it's well worth the money...