Possible Duplicate:
Is there a quick way to lock my Mac?
Does OS X have the option to allow you to lock your screen?
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marked as duplicate by Loïc Wolff, Casebash, Kyle Cronin Mar 9 '11 at 1:41
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
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Yes set System Preferences->Security->General to require password after screen saver begins
And in System Preferences->Desktop & Screen Saver->Screen Saver hit the hot corners button and choose one or more of the corners to Start Screen Saver
There are also Dashboard Widgets to help here. I have not used any recently.e.g. a widget to lock and others to send the mac to sleep.
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Yes, Keychain access, show the status in taskbar, you will see a lock screen option.
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In addition to screen saver and sleep lock (see Mark's answer), you can also enable fast user switching and use the menu to go to the login window without logging out. You can also do this through the command line without enabling fast user switching:
/System/Library/CoreServices/Menu\ Extras/User.menu/Contents/Resources/CGSession -suspend
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There's a project called Dockables that is nice: http://getdockables.com/
It's a collection of apps for key system events, like log out, lock screen, sleep display, etc... I have the "lock screen" installed and use it a lot. I don't keep it in the dock, but I call it using spotlight.
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Alfred App allows you to issue system commands including 'Lock' & 'Sleep'. That's what kept me using it.
