WordPress Codex - The official online manual for WordPress.
WordPress 101 - This is a WordPress video tutorial series, a must have for learning how to run your WordPress website.

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1Password - 1Password is a password management program compatible with Mac (iPhone and iPad too) and Windows. Creating and managing secure passwords is critical.

Super Duper - Super Duper is a hard drive backup and system recovery program compatible with Mac.

Other World Computing - While geared towards the Apple platform, OWC offers a wide variety of hard drive products for media storage and backup.