After much research we have signed on as a partner for Norada Solve360 Customer Relationship Management (CRM). We compared it to Zoho, BatchBook, insight.ly, and Salesforce.com (which we use internally but will be switching). The Solve360 user interface is fantastic, simple to use, yet powerful. Google Apps is not just an application but a platform into which many products can already integrate.
When you combine Norada Solve360 with Google Apps, Mailchimp/Constant Contact, Freshbooks, plus Mobile contacts and calendar synchronization you have the ultimate integrated platform for superior customer relationship management, marketing, sales results, project management, time management, and invoicing.
Solve360 pricing starts at $40 per month for 3 users which is a huge bargain compared to the market leader Salesforce.com at $195 per month for 3 users.