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1Password 4.0 - A required password app - $7.99
Ever since the invention of the password there have been hacks (just ask Mat Honan). It's an imperfect solution for security but the venerable password isn't going away any time soon. In order to protect your identity, financial/health data (and baby pictures) you need to a) stop using the same password on multiple websites, and b) stop storing all of your "strong" passwords in an Excel spreadsheet on your computer. 1Password ($7.99, App Store) solves this problem by storing your passwords in an encrypted database that's protected by, one password. When paired with the OS X app and synchronized over iCloud or DropBox it's an unbeatable combination. 1Password for OS X ($49.99) is what really ties it all together, giving you the ability to create and submit passwords directly from your browser toolbar. This is single piece of software that I probably recommend the most.