I have not use Zoho CRM (http://www.zoho.com/crm/zohocrm-pricing.html) myself. But I understand it is very nice and easy to use. The free edition supports up to 3 users.
Alternatively, if you use Google Apps (Google's Business Email) then Insightly (http://insight.ly/) is a great solution. Google Apps (http://www.google.com/apps/intl/en/business/savecosts.html#utm_campaign=en&utm_source=en-ha-na-us-bk&utm_medium=ha&utm_term=google%20apps) free for basic service and Insightly integrates nicely.
Hi Biz Goddess,
Many great suggestions were listed. I'm curious as to which one you chose for your business and why. Please let us know about your experience. Good Luck!