[TalonDJ]

What google did is more analogous to recording CB radio transmissions than wiretapping.

Not so. CB transmissions are intended for the receipt of others (and even then recording them might not be legal). Wi-Fi is not intended for people outside your property to use. This is more akin to going into someone's house and taking pictures of their mail just because the door was unlocked.

[Wayne07]

Sometimes wifi is intended for the receipt of others (e.g., starbucks, or my neigbor's "guest network"). If you are broadcasting an unencrypted signal, then I don't see how your analogy of going into someone's house fits - there is no intrusion.

It is more like they were taking pictures of the street, and you left your door open and they accidentally captured you naked as you were walking to the shower.