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You should wipe and reinstall. Reasons:

personal info. Anybody can attach your macMac in target disc mode and copy the whole hddHDD for the later analyzeanalysis. Even if a file is removed by emptying the Trash, or via the "rm" unix command, herethere is a possibility to recover it. (because it deleted only the reference to hddHDD sectors and not wiped the sectors).
applications - If you have any applications, you probably want to use them later too. If you sold the macbookMacBook with them, the buyer will use them too - double install usually mean =means disabling your legal activation key.
with clean reinstall, you delete everything - for example /Library/Application support too, where much applications saving some infos (non personal, but anyway).
another example - the logfiles in the /var/log directory. Here are tons of informations whatthat can gainbe gained from them (for example mail addresses) and so on...
erasing the Home directory is simply not enough (see above).
as @Petruza already toldsaid - the only way is to wipe the whole HDD and reinstall the OS X.

You should wipe and reinstall. Reasons:

personal info. Anybody can attach your mac in target disc mode and copy the whole hdd for the later analyze. Even if a file is removed by emptying Trash, or via "rm" unix command, here is a possibility to recover it. (because deleted only the reference to hdd sectors and not wiped the sectors.
applications - If you have any applications, you probably want use them later too. If you sold the macbook with them, the buyer will use them too - double install usually mean = disabling your legal activation key.
with clean reinstall, you delete everything - for example /Library/Application support too, where much applications saving some infos (non personal, but anyway)
another example - the logfiles in the /var/log directory. Here are tons of informations what can gain from them (for example mail addresses) and so on...
erasing the Home directory is simply not enough (see above)
as @Petruza already told - the only way is wipe the whole HDD and reinstall the OS X.

You should wipe and reinstall. Reasons:

personal info. Anybody can attach your Mac in target disc mode and copy the whole HDD for later analysis. Even if a file is removed by emptying the Trash, or via the "rm" unix command, there is a possibility to recover it (because it deleted only the reference to HDD sectors and not wiped the sectors).
applications - If you have any applications, you probably want to use them later too. If you sold the MacBook with them, the buyer will use them too - double install usually means disabling your legal activation key.
with clean reinstall, you delete everything - for example /Library/Application support too, where much applications saving some infos (non personal, but anyway).
another example - the logfiles in the /var/log directory. Here are tons of informations that can be gained from them (for example mail addresses) and so on...
erasing the Home directory is simply not enough (see above).
as @Petruza already said - the only way is to wipe the whole HDD and reinstall the OS X.

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created Jun 1, 2011 at 16:16

You should wipe and reinstall. Reasons:

personal info. Anybody can attach your mac in target disc mode and copy the whole hdd for the later analyze. Even if a file is removed by emptying Trash, or via "rm" unix command, here is a possibility to recover it. (because deleted only the reference to hdd sectors and not wiped the sectors.
applications - If you have any applications, you probably want use them later too. If you sold the macbook with them, the buyer will use them too - double install usually mean = disabling your legal activation key.
with clean reinstall, you delete everything - for example /Library/Application support too, where much applications saving some infos (non personal, but anyway)
another example - the logfiles in the /var/log directory. Here are tons of informations what can gain from them (for example mail addresses) and so on...
erasing the Home directory is simply not enough (see above)
as @Petruza already told - the only way is wipe the whole HDD and reinstall the OS X.