Set Password Activation Time in Snow Leopard
In Snow Leopard, you can now set an amount of time after your Mac goes to sleep or engages the screen saver before it requires a password to log back on. In Leopard, the option was simply to require the password or not. Choose among several increments, between 5 seconds and 4 hours, from System Preferences > Security.
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Special thanks to Richard Theriault, Don Rost, Steve Bruce, and Ron
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Just depends on what sort of data you're storing, and your comfort level with storing that data with a third-party.
And on that topic, my bet is that we'll see an iPad app at some point, but not an iPhone app. But who knows!