Need to store files but keep them accessible? Dropbox is an app where you can store files in a cloud and easily retrieve them. Dropbox provides 2 Gigabytes free and the app is free as well.
Need to jot notes or ideas? Try Evernote. Again, the app is a cloud based app that allows you to save notes and not only retrieve them later, but allows you to search by keyword or tag.
Need to process a credit or debit card? Apps such as Square allow you to plug in a small swipe device and your mobile phone becomes a credit card processing machine. Several of the apps charge a percentage of the transaction amount and the app and sometimes the dongle are free.
Need to have a virtual meeting? Skype and WebEx allows for virtual meetings. Skype allows for face to face and WebEx gives you the ability to share files so that those you are meeting with can view the files as you review them.
Need to review files created in Office? Docs to Go is a mobile app that allows you to open, Word, Excel and PowerPoint files and even allows you to create Word and Excel documents.
Too many passwords to remember? Password Keeper and other applications like it have the ability to keep user id's, passwords and even the website url giving people the ability to store all their passwords in one application. So instead of trying to remember all your passwords or having a list, you only need one password, the one to get into the password keeper app.
With mobile technologies capacity continuing to grow the mobile platform will have continue to see newer and better applications that can help with running a small business.