While there aren't many wineries setting up shop in Oregon (likely due to different tax laws), some of the best vineyards in the region on the Oregon side.
For example, the entire cobblestone alluvial fan which defines The Rocks District of Milton-Freewater is in Oregon. And, one of the most industrious vineyard projects (initiated by Norm McKibben from Pepperbridge) climbs the hill on the southern side of the Valley.
Also, for you soil geeks, you'll find some of the most incredible basalt vineyard soils along the Northfork and Southfork river valleys in Oregon. Road trip anyone?