Above I have covered some of the best tools for finding hot trends and niche brainstorming including Google Hot Trends, eBay Pulse, Yahoo Buzz and others.
Rand over at SEOmoz has created a VERY cool resource that searches and displays the most popular searches, key phrases and products from all the above resources and others, to help you discover rising trends and buzz worthy new niches all in one place.
SEOmoz Popular Searches is free to use right now, with no sign-up or nag screens. It even lets you download the list as a CSV file to save and use later or massage with your favorite key word tool.
Rand's blog has more info about the tool and what it can do. Thanks Rand, I'm sure lots of our affiliates will want to add this to their niche-finding toolbox.