Comment Count Notify is easy to configure module that sends a periodic mail with count of comments there in approval queue.
For advanced configuration of mail sending intervals, UI of Elysia Cron can be utilized.
This module does NOT provide summary or any other information about the comments posted - for that you can check Notify, Comment Notify and Comment Mail modules.

This module is basically of use for site administrators/moderators.

Sample Mail

***Please do not reply to this mail***

Dear Admin,
You have 119 comments pending for approval.
To clear the pending comment approval queue, kindly login at http://example.com with your admin account and clear the comment approval queue at:

http://example.com/admin/content/comment/approval

Comparison of similar modules

You may also find something of your interest here
http://groups.drupal.org/node/15928

Dependencies

Comment(Core)
Elysia Cron

Development & Maintenance

Developed at and maintained by Srijan Technologies, India

Supporting organizations: 

Project information

Releases