Question for information security nuts....
DANGER, WILL ROBINSON!!!
For gosh sakes, please don't go typing your VIN number and build info into that web page!
My first thought is "heck, what's the big deal, any stranger can walk by my car parked in a parking lot, or even in my driveway, and copy down the VIN number," but internet bad-guys are getting so freakin clever these days I just want yuh tuh think this through before you go punching your info in. And I'm guessing that the OP is the guy running that web page.... (no offense, vagany; I'm just a suspicious old fart by nature, and yer a newbie with only a few posts, all at an ungodly hour of the (U.S.) morning and all on just one day).
Here, for example, is a fiendish conspiracy theory for ya (just by way of example): DoubleClick and many other internet advertising companies usually know your address (gained when you enter your address on a commercial web page operated by a company subscribing to their service), and can associate that address with a cookie set on your browser. So say I'm a really, really together high-volume car thief who has hacked into DoubleClick (or has purchased the DoubleClick data files from some other hacker); I know your address and can crack your DoubleClick cookie (this is a little tricky, but still do-able); I lure you and many others to my (Romanian?) web page, where you punch in your VIN and build info and I read your cookie. Voile! Almost overnight I have a really extensive database of where many of the (say, for instance) Campi white '09 TDIs in the U.S. and around the world are to be found at 3 AM local time. I can now offer my customers a real 'value-added' service...I can provide you overnight with exactly the 'used' car you want, right down to the exact color and equipped juuuust the way you like it, with ridiculously little effort on my part. When I get an 'order', I just go and reel in the nearest one found in the database. Or I sell zillions of copies of the database to other car thieves. Or both.
Addendum: a quick Google search of "bitnet.ro" reveals that these build decoders have been around on the web since at least 2004, appearing and disappearing, and most of them either Romanian or Russian. I have nothing whatsoever against Romanians or Russians...in fact, my own people are from over there...but in point of fact a very large percentage of the world's Internet scams are also from there, too.
How's THAT for paranoia? Huh? Huh? Remember: just because you're paranoid doesn't mean they're not out to get ya! In fact, now that I think about it, you couldn't pay me enough to punch my VIN and build info into that web page. A cool idea, perhaps, but very, very insecure.