I bought this for as a seedling for a buck at our local Xmas tree farm (now defunct so can't ask them). Grows very rapidly. Trying to nail down more specifics. Assume it is something native or near-native to the Pacific Northwest.

way out of my element here but here's a conversation starter anyhow: Common Name Jack Pine - fast grower - hardy in the Pacific Northwest
http://commons.wikimedia.org/w...
does it look similar to you?

It might be Lodgepole Pine, if the needles are long and in pairs.

I think I may need to locate one of those tree keys to better pin it down. I'll poke around online when I get a moment.