I”ll put them all here so when you ever need to restore to a previous version, you can download the firmware here.

iPhone 2G

iPhone Firmware version 1.0.0

iPhone Firmware version 1.0.1

iPhone Firmware version 1.0.2

iPhone Firmware version 1.1.1

iPhone Firmware version 1.1.2

iPhone Firmware version 1.1.3

iPhone Firmware version 1.1.4

iPhone 2G Firmware Version 2.0

iPhone 2G Firmware Version 2.0.1

iPhone 2G Firmware Version 2.0.2

iPhone 2G Firmware Version 2.1

iPhone 2G Firmware Version 2.2

iPhone 2G Firmware Version 2.2.1

iPhone 2G Firmware Version 3.0.0

iPhone 2G Firmware Version 3.0.1 (sms Hack Fix)

iPhone 2G Firmware Version 3.1.0

iPhone 2G Firmware Version 3.1.2

iPhone 3G

iPhone 3G Firmware Version 2.0

iPhone 3G Firmware Version 2.0.1

iPhone 3G Firmware Version 2.0.2

iPhone 3G Firmware Version 2.1

iPhone 3G Firmware Version 2.2

iPhone 3G Firmware Version 2.2.1

iPhone 3G Firmware Version 3.0.0

iPhone 3G Firmware Version 3.0.1 (sms Hack Fix)

iPhone 3G Firmware Version 3.1.0

iPhone 3G Firmware Version 3.1.2

iPhone 3GS

iPhone 3GS Firmware Version 3.0.1 (sms Hack Fix)

iPhone 3GS Firmware Version 3.1.0

iPhone 3GS Firmware Version 3.1.2

For completeness here are the Ipod Touch firmwares:

Ipod Touch Firmware version 1.1.1

Ipod Touch Firmware version 1.1.2

Ipod Touch Firmware version 1.1.3

Ipod Touch Firmware version 1.1.4

iPod Touch 2G

iPod Touch 2G Firmware version 2.2

iPod Touch 2G Firmware version 2.2.1

Boot loaders

Bootloader version 4.6

Bootloader version 3.9

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