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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
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The '[r]' is to avoid grep from grepping itself. (interchange 'r' by the appropriate letter)
Here is an example that I use a lot (as root or halt will not work):
while (ps -ef | grep [w]get); do sleep 10; done; sleep 60; halt
I add the 'sleep 60' command just in case something went wrong; so that I have time to cancel.
Very useful if you are going to bed while downloading something and do not want your computer running all night.