Intuit: www.intuit.com/mobile.
Intuit Intros QuickBooks Mobile for Android
QuickBooks Mobile for Android is designed for businesses using QuickBooks Pro, Premier and Online enabling users to perform such QuickBooks tasks as creating estimates, managing invoices and viewing customer details via mobile phones.The application automatically syncs with QuickBooks and provides access to customer and sales information.
Mobile access is free for any current QuickBooks Online subscriber and is available to QuickBooks Pro and Premier 2011 customers through a subscription. QuickBooks Mobile is also available for iPhone users. The free application can be downloaded directly from the Android Market or Apple iTunes.