This looks like an interesting development:

Shannon Latta EVP at Horn Group writes:

Today we announced our very own iPhone app, live in the iTunes App Store. We think we're the first agency like ours to design a mobile app like this -- that combines agency news and industry insights, sharing and commenting functionality, and a handy directory of our entire staff -- for clients, prospects and employees. Have you seen anything similar from anyone else? I know Lewis PR has a news aggregator for the iPhone but it's nothing like what we've built.

Here's our launch package:

• 
  Press release
• 
  Video demo of the application
• 
  The app itself

We're seeing a lot of interest from marketers who want a mobile presence for their brand. We think it's becoming as important as having a website and agencies have to evolve to meet this need. Our iPhone app, built entirely in-house by Horn Group ID, shows off some of our new mobile capabilities. We can quickly and affordably build applications like our own for clients -- ideal for sales, marketing and employee communications.

I applaud Horn Group for taking this step and I look forward to hearing how it is used and if apps are a good vehicle for PR.