Few writers put the kind of thought into user interface that John Gruber of Daring Fireball does, and that shows in his lengthy review of the iPad. It's very much worth reading for his detailed impressions in support of why the iPad is Apple's reconception of personal computing. follow link
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.
- ExtraBITS for 12 April 2010 (12 Apr 10)
John Gruber of Daring Fireball Reviews the iPad