iPod touch 3G:
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- Headphones: Apple earphones with remote and mic.
- Display: fingerprint-resistant oleophobic coating.
- Features: OpenGL ES 2.0, voice control, better battery, accessibility, home screen background (iOS 4) and multitasking (iOS 4).
iPod touch 2G:
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- Headphones: Apple earphones without remote and mic.
- Features: OpenGL ES 1.2.
Source: www.apple.com