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iPhone apps have been downloaded 800 million times, and there are now more than 25,000 apps in the iTunes store. Apple is detailing some of the new features in the next version of the iPhone OS in apress conference going on live right now.

Cool apps that surprise and delight mobile users—built by developers like you—are a huge part of the Android vision. To support you in your efforts, Google launched the Android Developer Challenge, which will provide awards for great mobile apps built on the Android platform.

AT&T is changing its mind and now says iPhone VoIP apps will be able to run on its 3G wireless network.Previously, Internet phone apps like Skype and the new Vonage app were forced to operate on wi-fi hotspots, which limits their utility.

Do you have an app that you wish was on the iPhone, but hasn't been developed or ported over yet? Certainly we all have our wish lists when it comes to apps, but one that I've been waiting for since the beginning is the chat and VOIP program, Skype (Mac or Windows). Fortunately, the folks over at Skype have finally put together a great app for iPhone and if you've never used Skype, I'm here to tell you why you will be soon.

The new Google Apps Marketplace extends the search giant's underpowered applications suite, offering a collection of other vendors' Software-as-a-Service applications that work with Google's cloud. The new online store also gives Google a new, if small for now, revenue stream that isn't driven by search-related advertising.

Rest assured that 2010 is going to be a big year for the Android operating system, with many new handsets finding their way to stores around the world (including Google’s own phone) and an increasing number of developers building tools, games and the likes for the fast-growing platform.

Microsoft is opening the gates of its upcoming mobile application store, and developers can now submit their programs for approval.The Windows Marketplace for Mobile will debut in the second half of this year and will offer an over-the-air portal for Windows Mobile users to browse, buy, download, and install apps on their handsets. The company is hoping to mirror the success Apple has had with its App Store for the iPhone and iPod Touch.