To put 3rd party applications on your iPhone or iPod Touch follow the steps below.
1. Visit www.jailbreakme.com on your Safari browser(on the iPhone/iPod Touch)
2. Scroll down to the bottom and click the ‘Install AppSnapp‘ link
3. Once it finishes you should be able to use Installer.app(should see the icon)
From here you have two choices.
Nothing. Go ahead and install the apps you want.
Continue. Update to 1.1.2(and jailbreak again).
1. Go into Installer.app, select ‘all packages’ and install ‘Oktoprep’
2. Plug the iPhone/iPod Touch to the computer and open iTunes
3. Click the ‘check for updates’ button in iTunes and update your iPhone/iPod Touch to 1.1.2
4. While it is updating download THIS archive and extract it on your computer
5. On Windows make sure you have Java installed then double click on windows.bat, on a Mac, double click on jailbreak.jar
6. Do what it says and you’re finished!!!
After the 2nd reboot of your iPhone/iPod Touch you will see the Installer.app and/or SSH.app icons.