I like Evolution's clean interface and integration of PIM functions.
The one feature from K Organizer I miss in evolution, is the 
ability to nest hierarchical tasks. Being able to nest tasks
provides a light duty project management capability as I can 
have a task and then break it down into a series of activities
that need to be done to compelete the task.  I have approximated
this by creating multiple task lists, but when all of the task lists
are 'on' the items from all the lists are mixed together and of course
one can only create a top level of categories for tasks.

Regards,

Bob.