commandlinefu.com is the place to record those command-line gems that you return to again and again.
Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.
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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.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
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This is useful for working out whether the file that you are unzipping is an evil zip file which will create 200 new files in your current direction
The URL can then be pasted with a middle click.
This is probably useful when trying to explain problems over instant messaging when you don't have some sort of shared desktop.
This is useful for use in scripts.
Note that this will leak your password to ps, so this shouldn't be used on shared machines. Use key files for this
This is useful for command line 'recycle bins' and such like