Sprint announced earlier this week the introduction of the Sprint family locator here. I believe this is one of the first commercial deployments of LBS technologies in North America that isn't fleet management. Very cool. Wavemarket, the same company that offers Streethive is powering the product.
Based on the lack of understanding of phone applications by the over 30 set (What's a ringtone?) I am curious how many kids will help their parents set up an application that allows their parents to track them. There are interesting privacy and security issues in the discussion of LBS and this too will be a hot topic in the coming year or so as more consumer offerings begin to rollout.