Because I am an impatient motherfucker, I filled out and mailed my ballot the night it arrived in my mailbox. Using the King County ballot tracker, I could tell that they received my ballot within 48 hours, but for the last couple weeks, it's been stuck at the signature verification part of the process. I was a little concerned, because I never sign the same signature twice, so I've checked the ballot tracker every day. If there were any problems with the verification process, I wanted to deal with them as quickly as possible. Finally, today: SUCCESS!