Sorry for reposting nearly reposting the same answer.
This is possible. I think the basic method you need is `findWorkTasks()`on that base you can send an email to notify the user about his/her assigned tasks. See [API][1] for further informations.
From the [designer guide][2]:
> In a Daily notification mail you might
> need a task list for a user that she
> may activate and work on. The method
> findWorkTasks(..) on ivy.wf does this
> job. It uses even substitutions and
> absences to collect the correct task
> list (see IWorkflowContext interface
> in the PublicAPI documentation for
> more details)
Hope this helps.
[1]: http://www.xpertivy.ch/releases/Xpert.ivy/5.0.11/documents/publicApi/ch/ivyteam/ivy/workflow/IWorkflowContext.html
[2]: http://www.xpertivy.ch/releases/Xpert.ivy/5.0.latest/documents/ServerGuideHtml/ivy.server.concepts.emailnotification.design.html