With so many mobile business applications on the market, here are a few of the best for business collaboration and productivity.

Scan2PDF Mobile by Burrotech
Best for: Remote Document Storage and Organizing
This software allows the mobile user to scan contracts, receipts, and other business documents with their smartphone and convert these documents to PDF files. The PDF files are stored on your phone and then may be emailed. Scan2PDF is available on Windows Mobile phones, and the iPhone and Android platforms. 

Fring
Best for: Social Networking and Mobile Communications
Fring allows the mobile professional to receive IMs and updates from Twitter and Facebook users, Skype, MSN Messenger, Google Talk, Yahoo, and others by consolidating messenger clients into one mobile app. This allows the mobile user to chat with multiple people on multiple programs all in one place. Fring is available on all major smartphones, on any mobile operator, and any mobile Internet connection (3G/4G, Wi-Fi, GPRS, EDGE). Fring supports Symbian S60, iPhone/ iPod touch, Android, Windows Mobile, MeeGo, Linux, J2ME, and proprietary OS. Already with tens of millions of users in more than 200 countries, Fring adds more than half a million users each month, and the app is free. 

Box.net for Business
Best for: Business Collaboration and Cloud Storage
Consolidates all content in the cloud in a secure environment that enables users to share files and folders. It also provides, anywhere access and allows users to create documents, manage workflow with tasks, and view previous document versions. Best for the Android and iPhone.  Says ReadWriteEnterprise, “Android has seen astounding growth in both the consumer and enterprise markets, but the iPhone and BlackBerry have dominated enterprise-specific app development. That may be starting to change. Today Box.net released its cloud storage app for Android, and other enterprise-focused apps have been released recently as well. Given the enterprise interest in the iPad and the fact that several Android tablets are supposedly just around the corner, we could start seeing more enterprise Android development.” Inc.com also named Box.net as one of the hottest 500 companies.   
 
Yammer
Best for: Internal Corporate Communications and Collaboration among workgroups
Yammer brings together all of a company’s employees inside a private, secure enterprise social network. This enterprise platform lets businesses set up a Twitter-like service allowing for the open exchange of ideas, links, and documents within enterprise communities. Rather than broadcasting to everyone, Yammer users set up both internal and external groups to communicate directly. According to ComputerWorld.com, it’s a great way for project teams to send quick status updates, documents, and other information to members. Yammer enables users to communicate, collaborate, and share more easily and efficiently, reducing the need for meetings, increasing communication across silos, identifying pockets of expertise, and connecting remote workers. Yammer has an app for the iPhone, BlackBerry, Windows Mobile devices, and Android.

WebEx by Cisco
Best for a: Virtual Meeting
The mobile employee can attend a business meeting anytime and anyplace with this free application without a WebEx account. Only those hosting a meeting must set up an account. Best for the iPad, the WebEx application includes simultaneous two-way audio so you can actually join in the conversation and view shared documents.