Your post made me remember...isn't the house next door or across the street vacant/possibly for sale? That could certainly be cause for strange vehicles to be around. Realtors, bankers, appraisers, potential buyers, etc.
Oh BTW Oriah, is there a link to where I (or anyone else) can look up the pings and stuff on NORAD? That would be really interesting! Thanks
We have software specifically designed for that purpose- but you can take a look here to see kind of how it works:
http://www.n2yo.com/database/
It won't help you match up the pings (you need to be able to access the logs for that) but it will show you how it works.
(Warning: there are a LOT currently floating around, lol!)