How to erase all my data before selling my macbook 10.5.8 but no the applications

I'm passing my mac to a friend and I would like to delete all my persoal data but NO the applications.
What is the best  and most secure way to do this.
Thanxs

The only way to securely remove all your personal data is to zero out the hard drive then install a fresh copy of OS X.  Provide the installers discs for any software you are providing with the computer.  You should provide all the original discs, serial numbers, etc.  The new owner can then install the software and personalize it themselves.
Drive Preparation
1.  Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button.  When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
7. When formatting has completed quit DU and return to the installer.  Complete the OS X installation.  At the end of the installation will be the Restart screen.  Do not restart the computer.  Instead just shutdown.  When the new owner boots up the computer they will begin with the Setup Assistant jus like the computer was new out of the box.

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