Well, lightning struck and I had my first bike theft. Rode it Saturday to and from the farmers market, unloaded, rode a bit more and I guess I blanked out and either forgot to lock it or completely forgot to wheel it into my fenced-in area with the rest of the bikes. Noticed my helmet laying on the drive way Sunday evening, went down to retrieve it and noticed my bike MIA. Bummer. Took both my locks and my lights, too. At least they left my helmet!
Fortunately, it wasn't a very expensive one - $250 Schwinn Trailway. With some small humor, I was planning to buy a "backup" bike this weekend - an inexpensive fixed frame single speed - for this kind of occasion. Looks like I will have to step it up and get a better replacement. Likely, I'll just buy the same model. It was pretty good for a department store bike, I think.
I will be getting back into the habit of bringing them in every night; I guess my roommates will overlook any inconvenience now that they've seen this happen first hand.
Lesson: Always double check your security!