Great Portland rock I'm just getting around to checking out...
Menomena
Boy Eats Drum Machine
The Shaky Hands
Blitzen Trapper

RIYL: Super Furry Animals, Radiohead & The Flaming Lips
ok, the Radiohead part is a bit of a cop out, I don't mean folks like near twins the Muse, but more like like minded, artists who aren't afraid to push boundaries a little. Also, you could say TV On The Radio and maybe (I can't even believe my fingers can type these words) the grateful dead (just a bit on a couple Shaky Hands and Blitzen Trapper songs). Somebody else said acoustic Neil Young, that's much better, but not what came to my mind. Nevertheless, these bands are all quite good and deserve you attention.