Contact management

[damian]

I have a small business and would like a contact management system which 
is easy to browse contacts and look at all previous correspondence. It 
would also be good to be able to 'tag' people into different categories 
(eg friend, supplier, customer). Ideally it would be good to be able to 
set up my own fields for input but I worry that the more I configure 
something the more chance there is that I'll break it and loose 
everything. The thought of loosing all the data, or the data becoming 
obsolete because I used the wrong program is enough to keep me just 
having individual txt files in a directory at the moment.

Any thoughts?

Cheers
Damian