Let me tell you something about tasks. If you work in any corporate job, you will get feedback on how good you are about remembering to do tasks. Having a long list of tasks on your Outlook or Lotus Notes not only makes you look important, it helps keep you on your toes. This is why I favored using Outlook sometimes over GMail. Now GMail has hit Outlook where it hurts.
Microsoft Outlook has a function that enables users to add and prioritize tasks. GMail has matched that function. To set it up log into your GMail account, click on Settings -> Labs, and then click enable tasks. Make sure to save the settings. Then you can add incoming messages to the task list by clicking on the pull-down actions menu.
The task menu floats at the bottom right of GMail. I think it would be better if the GMail team placed it on the sidebar by the Labels and GTalk functions. Something about having it float at the bottom right seems off to me. It’s a great start though. Hopefully this feature will become a priority to improve upon and become an official GMail feature.