Install the fix wordpress malware removal Firewall Plugin. This plugin investigates requests that are net to identify and stop attacks that are obvious.
Safeguard your login credentials - Don't keep your login credentials where a hacker could locate them. Store them offsite, as well as offline. Roboform is good for protecting them, also. Food for thought!
Harness Scanner goes in search of anything suspicious through the files on your site comment database and post tables. It informs you for plugin names that are odd. It does not remove anything, it warns you for possible threats.
In addition to adding a secret key to your wp-config.php document, also think about changing your user password to something that's strong and unique. WordPress will let you know the strength of your password, but a great tip is to avoid common phrases, use letters, and include amounts. It's also a good idea to change your password frequently - say once.
These are only some of the things I do to protect my blogs. Thing is they don't require much time to do. These are useful site simple solutions, which can be done easily.