TOC alerts are available in numerous databases and from publishers. Follow the database's instructions to create a TOC alert. You may be asked to log in/register or create a profile to complete the alert process.
Have a look at your favourite journal and see whether they offer this service.
Citation alerts notifiy you when a document or author has been cited.
Some online tutorials:
Most databases require you to register for free to create a profile in order and create an alert.
Look for the help section in each database. Follow the instructions to set up an alert on your saved search. Visit the list of databases at CQUniversity to select the ones relevant to your area of research.
Some online tutorials:
Many online book sellers offer free recommendation and notification services when new items are added to their database. A similar service is offered by some publishing houses. By registering with them you will be emailed when new items in your area of interest are published.
Selected examples:
You can be notified of new or changed web pages just as you can for journal articles and books.