Version:           4.2 rc1 (using 4.2.00 (KDE 4.2.0) "release 83.1", KDE:KDE4:Factory:Desktop / openSUSE_11.1)
Compiler:          gcc
OS:                Linux (i686) release 2.6.27.7-9-default

From the experience of my daily work with korganizer I'd like tell some wishes for better integration of recurring events and To-Dos. There seem not to be so much differences between them, except the attributes "Show as time as [Busy|Free]" (Event), "... percent completed" (To-do) and "Priority" (To-do). That's why I have the following suggestions:
1. GUI
- Remove the "Recurrence" button from the event editor and add a Recurrence tab as in the To-Do editor to make them look similar.
- Place the "Time associated" checkbox in the Event editor to the same place as in the To-do editor (below Start/End) to make them look similar.
2. Recurring events/to-dos
- At the moment, on recurring to-dos, reminders work only once. If there is really a use-case for reminding only once on daily or weekly to-dos, add an option to the to-do editor for each event whether to remind only once or each time before the to-do occurs. The same I would do for events. Nevertheless, I would make a repeating reminder the default for to-dos and events.
- At the moment, on recurring to-dos, the "..-% completed" is not reset or somehow handled for each recurrence, but globally instead. If there is for example a task which begins each week newly from "0% completed" you must reset this manually. On the other hand, if I set a recurring to-do to 100% completed globally to haven't it marked as overdue all the time there is a risk to remove it by mistake on "Purge completed". A better behavior would be to automatically reset it to 0% each time the Start time is reached for each occurence. There might be, of course, use-cases to save the completed state of a task globally, I would add an option here whether to reset the "completed" state each time the to-do recurs.