Paragraphs for Mac is a new markdown editor available in the Mac App Store that allows you to write your posts in markdown, including embedding images, and easily export them for publishing on your own via FTP. Not only does Paragraphs export your posts, it creates an entire site for upload.
Blogsy is a blogging iPad app that takes full advantage of the iPad's touch interface by making it super easy to drag photos, videos, links, and more directly into the post you are writing. Blogsy is a full-featured blogging app that any blogger is sure to appreciate and offers support for WordPress, Blogger, Tumbler, Posterous, Drupal, and more.
Posts is an iPhone and iPad app for the Blogger and WordPress bloggers out there. It features a gorgeous interface that supports multiple blogs on Blogger and both worpdress.com and self-hosted blogs with wordpress.org. The built-in post editor is very powerful, browsing through posts is a visually appealing experience, and comment management is a breeze.
Like Rene, my most-used apps of 2011 are probably the built in iPhone and iPad Safari browser, Mail app, and Reminders, Calendars, etc. via Siri. That's just the nature of the job. But since I'm TiPb's resident app editor, I also get to spend time with an incredible amount and array of App Store apps. Here are the ones I spent the most of my time with this year.
Squarespace [Free - iTunes link] is a brand new app that lets you administer your Squarespace web site -- at least the blogging aspects -- right from your iPhone and iPod touch.
The innovative hosted content-management system has become the darling of the technorati due to its robust online management tools and ability to scale to handle huge spikes in traffic (i.e. Digg effect). The app features: