Understanding and appreciating the new admin user, password feature during install that also gives you some subtle security upgrades.
WordPress co-founder Matt Mullenweg talks about Security measures for WordPress powered blogs and websites at WordCamp SF 2010.
If you use your phpinfo.php exetensively while writing blog / website code, here are some tips to protect the phpinfo file and other sensitive files from hackers using apache’s all powerful HTACCESS file(s).