This photo illustrates the utility of the D40's 1/500s flash sync for daylight fill-in flash.

EXIF of original (uncropped) image follows.
The EXIF of the "original" image on PBase is similar, except for the cropping that was performed in iPhoto.
PBase's EXIF chart for this photo reports that no flash was used. This is a known problem with the PBase software:
http://forum.pbase.com/viewtopic.php?t=28031

File name : 20070309_152808.jpg
File size : 1490757 bytes (2.0bpp, 12x)
File date : 2007:03:09 16:33:55

Image date : 2007:03:09 15:28:08
Resolution : 3008 x 2000
Flash used : Yes
Focal length : 24.0mm
Exposure time : 0.002s (1/400s)
Aperture : f/4.0
ISO equiv. : 200
Metering Mode : Matrix
Exposure : Program (auto)
JPEG Quality : Normal (2 bpp)
JPEG process : Baseline
Camera model : NIKON D40