This is probably one of the most exciting application to be announced for the iPhone since its launch. SHAPE Services, a German company, known for making mobile IM clients, has just announced IM+ for Skype for the iPhone, a website optimized for the iPhone which means it will allow you to access Skype via iPhone's Safari browser, no iPhone hacks needed here.
Thus bringing cost-effective calling to landlines and mobiles from your iPhone.
With IM+ for Skype you can now chat with Skype friends, call any PC, mobile or landline phone from wherever you are; making it very cost effective as all that you will be using is iPhone's data services which is unlimited. Based on information on their website, the other important aspect is it does not need WiFi and should work on AT&T's Edge network as well.
The application is currently in beta and hence the company is inviting people to participate in a beta testing round. They are also making it attractive and will be awarding an unlimited license for the most active beta testers.
IM+ for Skype 
also works with most of the other mobile phones like BlackBerry RIM, Windows Mobile Pocket PC, Palm OS, Symbian and J2ME devices but will cost you $25 after a 7-day free trial. You can try this out for free for a limited time on your iPhone.
