When I made the conversion from my Day-Timer to the Palm synced with Outlook, where to put all of the stuff I had been using the right-hand page to capture was a big concern. What I do now is make these journal-type entries in the note section of the respective task. For example, if I have a task that is to call Joe, while I am on the phone, I will record the date and time of the call, Joe's name, and important points about the call in the note section. When the call is over, I will amend the name of the task to reflect the next action and change the category name as appropriate. As I perform that next action, the notes regarding what has preceeded it are in the note section.
When there is no follow-up and I can simply "check-off" the task, I ask myself if this matter is of "lasting value." If not, I simply check it off. (I can still retrieve it through the search function in Outlook or Palm OS.) If it IS of lasting value, I add a date to the very first of the task line, and drag the task over to the "Notes" icon in Outlook. I never archive the Notes, so all of that type of journal unfo is available to me on either Outlook or my Palm.
Hope this helps.