We are using My Sites and WSS team sites to manage projects. What we
want to do is to use SharePoint's MY Site to manage their tasks which
have been created on different team sites that they have access too.
In other words a Rollup Task web part.

I don't really want to say that they have to manage their tasks in
Outlook and use the My Tasks web part to display them, as many users
want to use the tasks feature in SharePoint.

Any ideas on how this can be achieved?