It's hard to know who came first with the idea of MacBook Pro Theft software:
iAlertU got the most press and had their first press release on April 18, 2006.
But today, out of the blue ... comes TheftSensor ... with a website and seeming release dates and development dates back to March 29, 2006:
The current page at Theftsensor wasn't created until April 20th though. Maybe it was just reposted. There is a blog associated with the orbicule Theftsensor software site ... and it appears there have been 7 or so posts to the blog ... but ... with the blog being in blogger the dates could be altered to be any date the moderator wishes for them to be. I can place any date within the past two years as my blog entry time.
It is possible that they both thought of the idea simultaneously, but I doubt it.