Photo of Trumbo Point, a military housing community in Key West, Florida.
The following image probably fits nicely on your screen. It has been resized to 800x600 (Medium) using the Image Resizer, a free Window XP Powertoy available here. It weighs 97k. That's 83 times smaller than the original which you see below which weighs 8mb. That means it would load (or transfer via email) 83 times faster than the original image.
This original photo weighs 8 megabytes.
Image size: 3300x2550. Great for surveillance!
What resolution are you running on your computer? 1024x768?
And here's the same photo at 1024x768 image size. Weight: 179k.