You can request [email notifications for your inbox, if you haven't accessed it in a while](http://blog.stackoverflow.com/2011/10/improved-global-email-notifications/), which takes care of answers to your own questions, and comments to your posts or addressing you.

While you can mark questions as favorites by clicking the star, and have them show up [in your user profile](https://superuser.com/users/305751/java-thunder-man?tab=favorites), there's [no email notifications](https://meta.superuser.com/questions/3613/do-i-get-email-notifications-for-favorited-questions) for it.

[There's also an RSS feed for arbitrary tag subscriptions](https://meta.superuser.com/questions/6751/rss-feed-for-favorite-tags).