I usually just read and don't comment. A couple things..
Better information on the website. Even just a picture of the device. Preorder is just a mailto: - put a form on there at least, it adds to the legitimacy of the company even if it just forwards an email in the end.
And a third point - whats the status of the product? Expected Ship Date? Are you just putting this out there to see if there is interest in the product? Be honest with the consumer.
So you had the hook - there are people that clicked on the link because they want to track their bags.. but you need more.
Where is the move down button on Hacker News? I know you can give points to comments but there should be a way to quickly drop posts that seem a little sketchy.