Hello Pirkko Schildt
Outlook 2007 got rid of the Task Pad, but you still have the same functionality of Tasks appearing in a side bar with the "To Do Bar". All Tasks are automatically listed in the To Do Bar and we suggest simplifying the view, like we did with Task Pad. For To Do Bar to appear, choose View, To Do Bar (see shot below.)
(Note: all To Do Bar items are not Tasks. "Flagged" items--which is not typically a GTD recommended practice, will also be listed there.) We address all of this in the 2007 Setup Guide.
Also, 2007 brings a new feature of displaying Tasks that have a due date on the day they are due on your Calendar.
I know this all so well because I updated our Setup Guide for 2007 and just did one for Outlook 2010 beta too, that is posted to the Connect library.
Hope this helps!