Slog posted some more information about ricin. I need to do some more of my own research on just what it would take to dissolve a lethal dose in a drink. Given some of what I've consumed over the years, I'm not sure I would notice the addition of a foreign substance.
The whole thing just makes me angry and sad. If I still lived in Portland, I'd organize a pub crawl of every last bar. The last thing they need right now is decreased business because some crazy decided to use their printer. Just remember, if we stop drinking, the terrorists win!!