WordPress.org

Converts the default plain-text email notifications into fully customizable, sweet-lookin' HTML emails.

Multi-site support (for WordPress 3.0) will be added soon.

Notes:

• Emails are sent with readable plain-text versions for email clients that don't support HTML emails. Note: they're somewhat crude because they're auto-generated. I may decide to add decent-looking plain-text versions in the future, but that's low priority.
• Emails have only been tested on Gmail, Gmail on Android, and Outlook, but should work on most email clients (including clients without HTML support). If you're using a client other than the 3 I've listed, I would appreciate an email with info on whether the email looks like it should and works correctly.

Send your questions, comments, suggestions via email.