Through some random chance encounter on the net - that is to say,
I don't remember why I found it - I'm offline right now.
The tool of choice for going offline is a little Mac application
called Freedom, which disables your Internet access for a specified
period of time so that you can get things done. Written by Fred
Stutzman at UNC.
Freedom enforces freedom; a reboot is the only circumvention of the Freedom time limit you specify. The hassle of rebooting means you're less likely to cheat, and you'll be more productive. Not rebooting is why we bought Apple computers in the first place. When first getting used to Freedom, I suggest using the software for short periods of time.
It's a great idea, especially for the times when you find yourself
overwhelmed by the 1000000000s of possible things to do when you
are on line, and when reducing the number of options is key to actually
accomplishing any one task.
(Obviously I'm back online to post this!)