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Next you can and should change your root username to something other than "root". It's also a good idea not to always log in under and use the root identity.
If you work in an office you should always engage a screen lock or go to the log-in screen so your co-workers can't edit your files while you're away.
If you're at home you might choose not to give root passwords to your children.
You should also look at your logs frequently to make sure hackers aren't attacking your system and forgetting to clear their entries in the log.
You could install a hardware firewall or just a router so you won't have a public IP address.
Finally you could install a NAT box.
For more information on this and other *nix matters, see the All Things Unix forum.
Also read About DSL for lots more information