Guide to Creating New Activity Type in Dynamics CRM 2011
Functional and technical consultant Olivier Furnemont, walks through some of the finer points of creating a new "meeting minutes" activity type in CRM 2011. Further requirements include the ability to audit the field values and assigning actions related to meeting minutes.
Furnemont steps through the object model of the new type, as well as the steps involved in creating hte new activity type, its fields, and its form.
The end result of the case can be seen below, but you'll need to visit the original post for all the details.