Although details are still appearing, Sophos is reporting that a particular combination of circumstances can result in FileVault passwords being exposed in plain-text log files. The combination is somewhat unlikely — the Mac had to be using FileVault 1 under Mac OS X 10.6 Snow Leopard, be upgraded to 10.7 Lion, and then updated to 10.7.3, all without switching to FileVault 2. Nevertheless, if this applies to you, change that password! follow link
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Using Keyboard Commands While Screen Sharing
In Snow Leopard, screen sharing now properly transfers all keyboard commands to the remote server. For example, the Command-Tab application switcher switches applications only on the remote system's screen.
FileVault Passwords Potentially Logged in Plain Text