Currently in the Marketplace developer's portal there's no way to check and see how many submissions you have left. You see a count when submitting a submission but no where else. Mike Liu posted a suggestion on how to find out how many submissions you have left.
Hi All,
To check how many credits you have, you may create a dummy entry and enter sufficient data so it is in "Ready for certification".
Click "Submit for certification", check the count on the confirmation page, and cancel.
Though not ideal, it's a handy workaround I use myself.
Regards,
Mike, Microsoft
Tags: Windows Mobile, Windows Phone, Marketplace