Brian --
This is a good question that reveals an annoying feature of Project Server
2007. No, there is no way to display summary tasks, either in the My Tasks
page or the My Timesheet page. In fact, the only way to see the RBS for any
task on either the My Tasks page or the My Timesheet page is to click the
name of the task to display the Assignment Details page for the task. At
the top of the page, there is a Task Path field that describes the RBS, but
it is difficult to read.
Therefore, the best suggestion I can give you is to be very descriptive in
task names so that team members can distinguish similar-named tasks from one
another. Hope this helps.