The two Brad's (Avakian and Witt) are definite candidates, and Elizabeth Furse has been mentioned as a possible. One of the biggest questions right now is when the Governor will call the election. If it's within 80 days of Wu's official resignation, then candidates will be chosen by convention. After 80 days (which is how Oregon usually does it) there would be an open primary before the election.
Personally, I'm not that inspired by any of them, but I'd give my vote to Furse based on her experience. I wish Steve Novick would move into the district and run, but that's not gonna happen.
http://www.blueoregon.com/2011/07/if-wu-resigns-what-happens/http://www.bradavakian.com/http://wittforcongress.com/http://blog.oregonlive.com/mapesonpolitics/2011/05/elizabeth_furse_ponders_return.htmlhttp://www.ontheissues.org/House/Elizabeth_Furse.htmhttp://www.blueoregon.com/author/steve-novick/The one thing, at least, we can be sure of is no matter what, OR-1st stays blue. No rethug has had a prayer here in decades.