In this collection of apps, you'll find tools for getting work done on the road, keeping in touch with coworkers, and getting quick information. Best of all, every app in this list is free.
That means you can try them out at no risk: keep the ones that help your business and delete the others. Your work is crucial, and a free iPhone app is a top-notch assistant.

1) Documents Free: A lightweight office suite with a spreadsheet, text editor, file browser, and Google Sync.
2) DocWrite: Dictate into this app and it will transcribe your notes and store them for you.
3) iAnywhere Mobile Office: This app extends Lotus Domino and Microsoft Exchange to enterprise iPhone users.
4) Invoice2go Lite: The 10 included invoice styles make it quick to submit your invoice and get paid.
5) iTalk Recorder: This voice recorder offers three quality settings and the ability to add to existing recordings.
6) JMDictate Free: This dictation tool lets you add material in the middle of existing dictation sessions and includes flexible sharing options.
7) QuickVoice Recorder: A powerful voice recorder that can record seconds or hours of audio.
8) Right Signature: Sign proposals and other documents right on your phone.

9) AT&T Virtual Receptionist: Project a professional image with a virtual receptionist.
10) Box.net: Access your files from anywhere and share them with anyone with a Box.net account and this app.
11) Cisco WebEx Meeting Center: Set up and attend WebEx meetings from your phone.
12) Conference Call: Schedule conference calls from your phone. You can get a free account with 100 minutes per month.
13) DUB: Easily exchange contact information with other DUB users.
14) Linked In: Get information about your Linked In network while you're on-the-go. Learn about the person you're meeting with or post a question to your contacts.
15) PGI Mobile: This app lets you hold conference calls and even record them.
16) Salesforce Mobile: Start a free trial and always have your sales data close at hand.
17) Skype: Don't pay a fortune for iPhone calling; Skype gives you free Skype-to-Skype calls.
18) Yammer: Share your current project with other Yammer users and get feedback and helpful advice.
19) Accept Credit Cards: MerchantWARE customers can use this to process credit card payments from their phones.
20) Citrix Receiver: Citrix users, access any Windows application or file from your iPhone or iPod Touch.
21) GadgetTrak for iPhone: If your iPhone gets lost or stolen, this sneaky app will help you get it back.
22) IRdesktop: Use this remote client to view and control your Windows desktop. Click for a list of supported systems.
23) mBox Fax & Voice: Receive faxes and voice mails on your iPhone or iPod touch.
24) Mocha VNC Lite: Use your phone to access a VNC server, then connect to your office computer.
25) Network Ping Lite: Maintain your network and debug any problems with this utility.
Next Page: More free iPhone apps for business travelers