You can now subscribe to a tag (or set of tags) and get an email when new questions arrive.
To begin, visit the Tag Sets page on stackexchange.com, and either create a new tag set, or find a cool tag set someone else already put together.
Click on a tag set to browse the questions, and look on the sidebar for the email subscription option:
Once you click subscribe, you can indicate which email address you want to use, and how often you want them to be emailed to you — every 15 minutes, every 3 hours, or every day. …