You can save your searches as an email alert or RSS feed in most databases, including Scopus, Web of Science and PubMed. That means you'll get automatic notification about new articles which match your search.
Many databases also allow you to create Cited Article Alerts, so you can be notified when a particular paper is next cited. This is a good way to track who is citing you.
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A range of blogs reporting news and opinion on a range of science topics.