Wunderkit – a GTD iPhone app that allows users to work on a project with friends and family – has recently hit the App Store.

The application, which we first told you about last week, allows iPhone and iPod touch users to organize their lives with a little help from friends, family members and colleagues. Thanks to some rather clever social network integration, Wunderkit can hook-up with Facebook and Twitter, allowing users to invite friends and followers to a collaborative task or project.

As outlined in the app’s release notes:

Wunderkit is a place that lets you organize and accomplish all of life’s projects, however big or small, with the help of your friends, family and colleagues. Whether it’s a family reunion, a vacation or something for the office, Wunderkit will make it happen. It was built with you in mind…

Key benefits and features include:

  • Organize all of life’s projects in one place, and become more focused.
  • Work with your friends and get social by commenting on and liking updates, tasks and notes.
  • Stay up to date with your projects anywhere, anytime with cloud sync between the web and iPhone.
  • Workspaces: Have a project? Create a workspace and begin working on it in seconds.
  • Built-in apps: Brainstorm with Notes, organize with Tasks, and track team progress with Dashboard.
  • Collaboration: Invite your friends from Facebook and Twitter, and work with them as a team.
  • The stream: From status updates to recent activity, you’ll always know the status of your projects.

If you download the app you’ll be able to access its “pro” version for free for 90 days – this allows users to collaborate within workspaces that are not their own; the free account limits users to their own projects and work spaces (though others can collaborate with them). Following the 90 days, Wunderkit Pro will set users back $4.99/month.

However, as mentioned you can take the pro version of Wunderkit for a spin free of charge, and enjoy the premium service for 90 days before having to either subscribe, or demote yourself to the free version of the app.

Take a look at Wunderkit for iPhone in the App Store now, and be sure to post your thoughts in the comments.