SAP CRM is a very popular and expensive CRM application. If your job requires you know SAP CRM then I would of course highly recommend you look into educating yourself.
I am a closet CRM Junkie and love a good CRM and all the data it stores. I think once you understand a CRM you will be a better person.
I really like SugarCRM and you can download VMWare Player and a SugarCRM package and then play with it as well.
I think over the next 10 years your going to see SAP CRM become one of the top 3 CRM packages out there if not the #1.