Thanks for the tip, I usually head further east to find the twisties, but that'll make for a nice early evening ride after work (I'm in Seattle BTW).
Other good routes: Check out the West Snoqualmie Valley road. From the roundabout between Carnation and Duvall (Monroe-Fall City road), head east on 124th, then hang a right at roads end. Very tight 20mph twisties, you eventually come out by Maltby. LOTS of well maintained, twist county roads in this area. It's fun to ride around west of Woodinville and just explore, you'll find lots of great riding.
Highway 9 between Arlington and Sedro Wooley is a great road. If you want a really nice all-day ride, head up 9 to Sedro Wooley, then head towards Anacortes and Whidbey Island, travelling down through Deception Pass then taking the Mukilteo Ferry back to Everett/I5. That's a great, but long, ride since you get a little bit of every kind of riding on that route.
And finally, since it's almost summertime, I leave you with three words:
North Cascades Highway.
"At no point in your rambling, incoherent response were you even close to anything that could be considered a rational thought. Everyone in this room is now dumber for having listened to it. I award you no points, and may God have mercy on your soul."