Currently I'm working on a complete rewrite of the Notifier module and accompanying HTML Email plugin. Features will include:
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Allows subscription to several content areas: forum topic, structure category (page/forum category), comment thread (page) or PMs. More can be added.
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Allows auto-subscribe to your own content, according to user preferences.
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Receive automatic notification by email of new content, including a summary of the newly posted content and links to see the content on-site or unsubscribe.
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Emails can be sent immediately or as a daily, weekly or monthly digest (requires Cron Manager), according to user preferences.
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User preferences can be configured for each content area (topic/category/comments/pm).
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Assigns template tags for quick subscribe/unsubscribe in content areas.
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Includes standalone overview of subscriptions and user preferences.
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Emails can be in HTML or plain text, according to user preferences. Notification by PM is no longer supported.
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HTML email requires a custom plugin which uses CoTemplate and Emogrifier to automatically generate cross-platform HTML emails with inline styles.
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Includes default HTML email templates based on HTML Email Boilerplate.
As you see, some functionality is provided by other plugins (HTML email and cron). These plugins provide general-purpose functionality, in order to allow these features to be used by other extensions as well.
Do you think Notifier needs other features as well? Let me know.