Nice review (as always) by Ars:

Here are the Pros and Cons of Photoshop CS3:

Pros

  • New interface is cleaner and makes it easier to work on smaller screens
  • Expanded support for 32-bit HDR images
  • 3D layers are easy to use
  • Smart Filters round out the non-destructive Smart Object workflow
  • Very fast and stable on Intel Macs
  • Photomerge, auto-align and blending of layers are powerful and intelligent features
  • Solid backwards compatibility
  • More readily-accessible presets in adjustments

Cons

  • Odd Exposé behavior for full-screen documents
  • Photomerge isn’t easy to work with in interactive mode
  • Need more control over 3D layer rendering styles and light control
  • Mapping images in Vanishing Point has flaws
  • Not all ImageReady features made it into Photoshop CS3

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