If keeping on top of trends—or better yet, staying slightly ahead of developing ones—is something you aim to do, definitely check out the Exploding Topics site.
It monitors and measures seemingly everything going on online—mentions, conversations, searches, etc.—to tell us what it determines are the, well, exploding topics folks are quite active with. It even shows us the growth in interest on the topic over time.
“But what niches?” you may be asking. Amazingly, seemingly everything too: the topics are organized and can be easily isolated by category. The categories are likely the best place to start, in fact, as you explore the site and learn all about the invaluable information and insight it delivers.