Volume Boost: increase the volume [Cydia]
VolumeBooster is a tool that, by changing some system files, should increase the sound coming from the speaker of the iPhone / iPod Touch 2G by 20%.
The procedure for the installation is simple, run Cydia and find "Volume Boost", available in the repository ModMyi. It works thriugh Winterboard, after installation you need to apply the Mod. VolumeBooster is compatible with all firmware versions.
Note: Do not install on the iPhone 3GS, because the audio there is already set to 100%.