Free laptop lojack and a nod at a dude named Drumm.

[Drumm]

The Wi-Fi location stuff is amazing. I only have one Wi-Fi near me, and it found me using only that. The DynDNS thing stemmed from this:

I can see how it might not be useful, prey > DynDNS without doubt. But DynDNS can be a good way to get in if you have backdoors in place.