If you use QuickBooks for your business and EBSuite for your Sales and Support – POP THE CORK! The two applications can be integrated in a very customizable way.
QuickBooks can also be integrated with EBSuite Action Templates and Action Sheets: http://blog.ebsuite.com/wp/?p=1290
To see some other details about setting up the QuickBooks integration see the blog: http://blog.ebsuite.com/wp/?p=1133
Here are the fields that can be in sync between QuickBooks and EBSuite: