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disable password logins

I can't emphasize this one enough. Unless you need to login from a lot of different machines, there really isn't any excuse not to do this. It also has the bonus of making logins really easy since you don't have to type a password.

If you host your systems on a VPS service like linode or slicehost then you have the backup of a web based console in case you screw up royally and have a HD crash on the one machine your SSH key was on (for example).

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