Six Apart, creators of Movable Type, today introduced a free web application, Blog It for iPhone Powered by TypePad.

Built specifically for iPhone’s Safari browser, Blog It for iPhone is designed to let you post blog entries or status updates, from wherever you are, to more than a dozen different online services.

Blog It for iPhone is essentially the mobile version of Six Apart’s Blog It for Facebook application, which was launched in April. Blog It now supports creating content on Blogger, Facebook, FriendFeed, Jaiku, LiveJournal, Movable Type, Pownce, Tumblr, Twitter, TypePad Vox, WordPress.com, and any WordPress.org site.

To try out Blog It for iPhone, visit blogit.typepad.com from your iPhone or iPod Touch. An OpenID, AOL, LiveJournal, Vox, WordPress.com or Yahoo account is required. 

Six Apart also plans to have a native TypePad iPhone app available when the App Store launches. TypePad for iPhone lets you post photos from your iPhone to blogs and photo albums on TypePad.

Michael Sippey, Six Apart’s VP of Products, demonstrated this new app during the keynote at Apple’s Worldwide Developers Conference this week in San Francisco. 

Expect a flood of similar applications in the next few months that will make it easier to blog and even podcast from the iPhone.

Apple has done a good job of making the iPhone a mobile content client. Now third parties are working to make the iPhone a content publishing platform, too.