Some settings
You can configure some aspects of MT 2.0+iGTD integration in the preferences / Integration tab:
Include mail sender in the task name
If checked, the e-mail added to iGTD from Apple Mail will include the sender and the subject of selected message. If not, only the subject will be imported.
Use the MailTags e-mail notes for the task name
By default, the subject is used for the new iGTD task's name. Having this option checked you can use this MT field's content:
for the new iGTD task's name - your note can tell you more than the e-mail's subject or sender!