I'm no good at estimating crowds, but easily over 1,000. Not bad, considering there was very little advance notice (we didn't even know about it until yesterday evening). Stayed up late making a sign like the one shown on my car yesterday. I'm uploading about 1,300 unsorted photos straight from the camera, if anyone wants to see some - it's about halfway through. There are some relatively decent photos of Bill up there.
http://www.flickr.com/photos/qnr (please note the 1,300 + typos of "their" :rofl: )
Here's a Photo with Bill, and Mrs. qnr (and she's taking a photo too) holding our sign. (The other side of the sign just said "Welcome Bill!"

Edit: typo