I use QuickBooks Customer Manager
For me, it makes more sense that CRM software integrate with the accounting software. We use QuickBooks and I had plans to switch to Peachtree, thinking that it was more sophisticated, when I encountered QuickBooks Customer Manager. Customer Manager integrates with QuickBooks Accounting software. Customer Manager could definitely use some improvement (and hopefully Intuit will address its shortcomings) but all said, it's improved things for us and kept me a QuickBooks user. In addition, QuickBooks appears to have made some great strides with their accounting packages in recent years such that some of their more advanced modules will likely give us everything that we need.
Customer Manager has been a great help, but it could definitely use some improvement. Hopefully, Intuit will address its shortcomings.
It does integrate with Outlook. It can import Outlook contacts (and I believe synchronize with Outlook contacts) and you can set it up to use Outlook's calendaring function rather than it's own. This would be useful, for example if you need to synchronize your CRM information to a Palm for use outside the office. But I've tended to keep my customer information seperate from my Outlook information.