Reddit has thousands of interesting subreddits, but how do you find the good ones?
This site makes doing that easier.
Each page shows you the top posts and lists all subreddits linked to in the sidebar as well as other subreddits that link to this subreddit.
This site has indexed 347,020 subreddits. Here are a few places to start exploring.
This site was made by Paul Rosenzweig. You can email him: paul.a.rosenzweig -at- gmail.