* Contacts Manager for Series 60 by AGORA plus, a.s.
* ALON Contact Guide by ALONsoftware
* SmartvCard for Nokia Series 60 by Symbianware
I found these three just under a quick search on "Contact" on Handango. I'm sure if you have alook around using Google, you could find some freeware alternatives.
There is a way to do it using your Sendo, but it is very time consuming - Create a group for each individual contact and treat the group section as your firm name. Of course if your firms can be grouped together in some way, this may make things easier.
"We were somewhere around Barstow on the edge of the desert when the drugs began to take hold..."