Canon 450D vs 400D

So, what's new and what changed?

The sensor:

• resolution climbed to 12,4 (12,2 effective) Megapixels
• delivering 14 bits image conversion to JPEGs and 14 bits RAW images

Viewfinder:

• bigger one, 0.87 magnification compared to 0.80 for 400D
  
• now displays ISO setting
  

Metering: spot (4% center) metering mode added
LCD:

• Larger, 3" but the same resolution
• includes LiveView with contrast detection AF

Extra functions:

• multiple shots self-timer
• original decision data for checking image security
• highlight tone priority
• auto lightning optimizer
  

AF: improved 9-point AF system
Menus: better usability by adding customizable My Menu
Storage: SD/SDHC cards used instead of CF
Battery: higher capacity, 1080 mAh compared to 720 mAh for 400D