Yes, you can.

Click My Account from the top of the right panel in the home page.
Click on the Edit tab on the following page.
Type all or part of your submission’s title in the Search Box and hit enter.
Check the checkbox on the right side.
Scroll to the bottom and select “Delete Selected” from the drop down.
Hit submit.
Confirm that you wish to delete your submission.

Thanks to Trickortreatsa for asking how to do this.  You may notice that the page you get when you click My Account is a bit different from the one you used to get.  It’s a bit more functional.  Please let me know if you find anything missing.