I lived in Portland, Oregon for 3 years. Granted I left about 8 years ago but some things still ring true.
There is no sales tax in Oregon. They get you on your paycheck though.
You do not pump your own gas. The attendants do it for you, this helps create jobs. You don't tip them.
It is an alcohol controlled state. There aren't a lot of liquor stores and the ones that exist are all rather expensive. Don't count on finding lots of sales. You can buy beer and wine at grocery stores though. To serve liquor at a bar you have to take a 6 hour course and pay a hundred bucks or so (probably more now). Not many bars serve both liquor and beer/wine.
Most bars do however have video poker machines that pay out run by the state. I paid my rent a few times by throwing a $20 in while having a couple beers after work.
Eugene is full of hippies. There are lots left over from when the Dead used to play there. I think they all just forgot to go to the next show and set up shop. Eugene is a weird college town. I only went there a handful of times and never during the school year, but it's a weird town.
If you're moving there for college, your teams uniforms are the worst in all of college sports. Seriously, google them. They're hideous.
It rains a lot there but it's just a light rain. Wear a coat with a hood. Umbrellas are for tourists.
Mt. Hood Rules. Hit all three snow parks there but only go to Ski Bowl if the snow is awesome or you're low on funds. It's the best when the snow is abundant.
Sisters rules (though I only went boarding there once).
Drive to Astoria and quote The Goonies and Kindergarten Cop.
Go to Hood River. Very neat little town and you can watch all the wind surfers from the Full Sail Brewery outdoor patio.
Stay away from Gresham (a suburb of Portland at the bottom of Mount Hood. Full of Meth addicts and you will run into people like the real life Beavis there.
Portland:
Portland is a town that thinks it's a city. Great public transportation and easy to get around on foot (in downtown).
There are some great microbreweries there. The Lucky Lab was my favorite.
There are more strip clubs per capita there than any other city. You must go to Mary's for at least one beer just to see it.
Powell Books and EM Records are must see stores.
The Crystal Ballroom is a great place to see a show. It has a "Dance on Air" dance floor. It's not as bouncy as it used to be though, but still very neat.
Get Coffee at Stumptown.
Can't think of anything else off hand, but feel free to ask questions and I'll try and help as much as I can.