It's pen & paper for me. I carry a notebook/diary that lists the day's tasks and on the adjacent page, I note down my own time log. During meetings, notes are taken and based on the action items (either I have to execute one or follow-up on one), an entry is made on the respective date. Detailed notes are little callouts.

In case I need to E-mail the notes over to a group of people or in case a lot of the discussion is technical discussion over a phone, then I use the notepad application to take down notes. After the meeting, I translate them into my notebook/diary.