Apparently, this application market has LOTs of entries. On LinkedIN, the list included:
In addition to SolomonCRM, you may want to look at the following options:
The list is far from comprehensive, because Delaware.Net's CRM and SalesForce aren't on the list. But all this does tell me that your business clients are looking for Hosted applications to help them be more productive. (Hint!) [Added note: SalesForce has a free version for the SOHO business guy... look here].