Bloomberg Law, Lexis, and Westlaw all provide the ability to set up alerts for legal topics and have those alerts sent to you via email. You can choose how often the alerts are sent.
Don't forget the power of KeyCite and Shepard's. Use these tools to monitor case developments and pending legislation.
Bloomberg's In Focus resources keep you up to date with editorially curated pages to find the latest news, commentary, litigation filings, regulatory developments, and practice tools on emerging issues and other topics of note to legal practitioners.
Many current awareness tools give you the opportunity to sign up for newsletters, to be delivered daily, weekly or monthly or as breaking news happens.