The T2i borrows heavily from the EOS 7D with the same 18-megapixel resolution, 1080i Full HD video with manual control and other advanced features, but at half the price.
Other Features Include:

• 18 megapixel CMOS sensor for tremendous depth, nuance and resolution
  
• 3" Clear View LCD with over 1 million dots for incredible detail
  
• Live View for viewing your subjects directly on the LCD
  
• 1080i Full HD video capture with manual exposure control
  
• Microphone input terminal for adding an external microphone
  
• Dedicated Live View/Movie button speeds switching from stills to movie shooting
  
• Dust-free recording with self-cleaning sensor and dust deletion software
  
• ISO range 100 to 6400, expandable to 12,800
  
• DIGIC 4 speeds processing and improves detail
  
• Picture Style recreates film characteristics by adjusting contrast, saturation and other controls
  
• High-speed, 9-point AF with superimposed focusing points in the viewfinder
  
• Auto Lighting Optimizer for superior shadow-highlight control
  
• Fully compatible with all EOS lenses and flash for unlimited creative potential
  
• Capture images at speeds up to 3.7 fps at full resolution
  
• Built-in pop-up flash and dedicated hot shoe for Canon E-TTL II flashes
  
• Accepts Secure Digital and SDHC cards; compatible with next-generation SDXC cards.