I have written a simple process which lets you email to all members of a group
This process takes in the name of a group as input parameter and emails to all members of the group
Before invoking the process make sure you have set the configuration settings of the email component(the last step of the process)
Click here to get the pdf file which has the process
Click here to get the pdf
Let me know if you have any further questions
Original article at http://eslifeline.wordpress.com/2009/02/10/emailing-to-all-members-of-a-group/.