When I commute to work, I use a disc lock and the steering lock. If I lived in an urban area, I would look into one of the alarmed Xena locks (check
www.sporttouringusa.com). If I'm out of town, I put a very large, one inch diameter Cobralinks through the frame and then through two 50 lb lead trunk weights, even though it's locked in the garage. When I started riding, I lived in New Haven, CT, and so just got used to locking it all the time. I also stayed away from mall parking lots, and still do.