As part of my various experiments, I've been going live on the internet. With the appropriate invite, you can see my position on gpsgate. I'm waiting to see how Twitter does location, but I have GPS and my V1 data which I could post.
Google is using the mobile map programs to detect traffic (though on google earth, either they didn't filter a plane, or someone was going 158 MPH a few weeks ago on i8 around El Centro).
Since people tend to crowd if they see I have a V1 (at least in my car), and there is trapster.com, my thought is to merge these ideas.
My V1 is great, but it would be even better if you were 5 minutes ahead of me and I could see YOUR V1 and others over the last few hours over the area I'm approaching. All automatically. And know someone with a V1 was over the area and didn't see anything in the last few minutes.
The only downside is it would require some kind of mobile internet or SMS access (basically you need to be able to tweet), and of course the GPS. The problem with some mobile phones is you need to listen to the V1 (bluetooth works but you need raw serial or equivalent). This is typically $20/mo for unlimited (It wouldn't take much bandwidth, but if there are lots of contacts, there will be a lot of internet or SMS blips). Then there's server bandwidth to do the aggregation (but Voyeradar1.net - letting non-V1 owners see the live map for a fee might pay for it - if they want to see my V1, let them pay).
So just like other internet stuff, it only really works if a lot of people would sign up.