Hi All,
Salesforce.com is really a good CRM tool.To experience it just create an account in developer edition and enjoy. To create a developer account, kindly use the below link

https://infallibletechie.com/2013/01/how-to-signup-for-developer-edition-in.html

Starting from Home page, explore all the tabs, create some records and experience the product.

Then use this link to study more: http://www.salesforce.com/services-training/training_certification/online/

Workbooks:

http://www.infallibletechie.com/2013/01/link-for-creating-warehouse-application.html

http://www.infallibletechie.com/2012/10/recruiting-application-in-salesforce.html