Here are links for both iphone and ipod Touch Firmwares
iPhone 2G (EDGE): 1.00, 1.01, 1.02, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 2.0, 2.0.1, 2.0.2, 2.1, 2.2, 2.2.1, 3.0, 3.0.1, 3.1, 3.1.2, 3.1.3
iPhone 3G: 2.0, 2.0.1, 2.0.2, 2.1, 2.2, 2.2.1, 3.0, 3.0.1, 3.1, 3.1.2, 3.1.3
iPhone 3GS: 3.0, 3.0.1, 3.1, 3.1.2, 3.1.3
iPod Touch: 1.1.4, 1.1.5, 2.1, 2.2, 2.2.1, 3.0, 3.1.1, 3.1.2, 3.1.3
iPod Touch 2G: 2.1.1, 2.2, 2.2.1, 3.0, 3.1.1, 3.1.2,3.1.3
iPod Touch 3G: 3.1.1, 3.1.2, 3.1.3
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