It seems that, from Google Cloud Console there is no way to delete a project.
Note: As of 2013-09-19 this is no longer an issue because Google had fixed
To delete projects created using Google cloud console, you can use the following method:
1: Create a dummy gmail account.
2: Add the dummy gmail account as an owner of the project.
3: Login into the dummy gmail account.
4: Accept your role as owner of the project.
5: Visit Cloud console.
5: Go to Cloud Console -> Permissions and delete the main user from the project.
NOTE:
Other than Step 2, rest all the steps should be performed using dummy gmail account.