For many iPhone users, the device's extensibility through a wide range of applications (or "apps") is the phone's main appeal over its competitors. Whether for work or play, apps come in all varieties — including the adult kind. However, for webmasters and other operators on the go, some apps are more useful or better produced than others are; and with so many choices, it is hard to know which tool is right for the job.

To ease this process, we turned to the folks that know the iPhone and its apps best: Apple. According to the company, "whether you're managing projects, clients, or your time, iPhone makes the perfect business partner." That sounds handy, so let us look at what Apple considers to be among this year's best of breed business apps:

Sales at Your Fingertips
Be business savvy on the go. With Salesforce Mobile, Salesforce subscribers have instant access to important business and client data wherever they are. Log sales, access charts and graphs, check the latest activity, respond to new leads, and much more.

Travel Light
Leave that stack of papers behind. With Quickoffice Mobile Office Suite, you can view, edit, and email your important Microsoft Word and Excel files from your iPhone. Tap to access local and remote files, create new documents, and stay productive even while you are on the road.

Get Your Money Back
Nexonia subscribers can keep receipts from piling up with Nexonia Expenses. Track expenses as you incur them. Then use your iPhone camera to photograph receipts before submitting expense reports.

Make Some Calls
The next time business takes you on the road, take iDialUDrive along for the ride. Create a list of all the people you want to talk to that day and iPhone will make every call — one by one — for you.

Get Organized
Don't just make a list of all the important things you have to get done. Organize them with OmniFocus. This Apple Design Award-winning app keeps track of tasks by project, place, person, or date. You can also upload photos and use built-in GPS to find nearby tasks to knock off your list.

For intuitive business and personal organization, Bento for iPhone is an easy way to keep your life in order. This personal database will help you manage everything from to-do lists and exercise logs to event planning and business contacts.

Attend a Meeting
Just because you're out of the office doesn't mean you have to be out of the loop. Use Cisco WebEx Meeting Center to participate in meetings and interact in real time. If you're presenting, control the show from your iPhone with Keynote Remote. Swipe the screen to advance, preview the next slide, or view your notes as you use Wi-Fi to roam the room.

Receive a Payment
With Credit Card Terminal, you can turn your iPhone into a mobile cash register. Accept credit card payments, email receipts, and refund sales listed on your transaction log, all on the go.

Watch the Time
Download iTimeSheet and track your time by client. You can also view activity reports, create invoices, and export the data into Excel.

While no means a complete list of all the productivity tools available for the iPhone, these dozen top apps can help you take your business to the next level and just may put a few more hours back into your busy day.