Shawn,
I hope that when you get home you can justify the purchase of the lens to your wife.

You sure take some awesome photos with it!
Thanks for the permission to post the EXIF info on the photos for all of us "beginner" photographers to use and learn from!
If anyone wants to try out the settings that Shawn used for the photos, here they are:
Photo1.
Camera Make: Canon
Camera Model: Canon EOS 40D
Image Date: 2008:05:06 18:06:19
Flash Used: No
Focal Length: 400.0mm
CCD Width: 4.58mm
Exposure Time: 0.0040 s (1/250)
Aperture: f/4.0
ISO equiv: 800
White Balance: Auto
Metering Mode: Matrix
Exposure: aperture priority (semi-auto)
Photo 2.
Camera Make: Canon
Camera Model: Canon EOS 40D
Image Date: 2008:05:06 18:02:54
Flash Used: No
Focal Length: 400.0mm
CCD Width: 4.58mm
Exposure Time: 0.0040 s (1/250)
Aperture: f/4.0
ISO equiv: 800
White Balance: Auto
Metering Mode: Matrix
Exposure: aperture priority (semi-auto)
Photo 3.
Camera Make: Canon
Camera Model: Canon EOS 40D
Image Date: 2008:05:06 18:02:38
Flash Used: No
Focal Length: 400.0mm
CCD Width: 4.58mm
Exposure Time: 0.0056 s (1/180)
Aperture: f/4.0
ISO equiv: 800
White Balance: Auto
Metering Mode: Matrix
Exposure: aperture priority (semi-auto)
Photo 5.
Camera Make: Canon
Camera Model: Canon EOS 40D
Image Date: 2008:05:07 15:10:41
Flash Used: Yes (Manual)
Focal Length: 400.0mm
CCD Width: 2.94mm
Exposure Time: 0.0040 s (1/250)
Aperture: f/4.0
ISO equiv: 400
White Balance: Auto
Metering Mode: Matrix
Exposure: aperture priority (semi-auto)
Photo 6.
Camera Make: Canon
Camera Model: Canon EOS 40D
Image Date: 2008:05:07 14:33:24
Flash Used: No
Focal Length: 400.0mm
CCD Width: 4.58mm
Exposure Time: 0.0056 s (1/180)
Aperture: f/4.0
ISO equiv: 400
White Balance: Auto
Metering Mode: Matrix
Exposure: aperture priority (semi-auto)
Thanks again Shawn! I can't wait for you to get home and start posting your Montana photos!

Dick