Here's something I really like doing: Clicking around Bandcamp and hitting "subscribe" on the pages of every halfway-competent hardcore band I can find. I check the internet for show fliers or hardcore-festival bills, and then I just subscribe to the pages of every band I'm not already subscribed to. That way, every time any one of those bands has something new out, I get the email right away. It reminds me of being in high school, getting the addresses for different labels from zine ads and then writing to those labels for their Xeroxed, stapled catalogs -- with the crucial distinction that I get to actually hear the music this time.