If you're looking for new niches or researching niches, here's how one person uses social networks as niche/blog topic research resources
Got this from the Yaro Starak mailing list. This dude has some serious blogging gems to share
http://www.entrepreneurs-journey.com...ctor-facebook/
Another nice source is Google trends. See
http://www.highrevenue.com/uncategor...g-google-trend
See
http://www.google.com/trends correlate this with what others are blogging about
http://blogsearch.google.com/
Also, try Twitter's search function to see how much "buzz" there is regarding your niche topic. Great for researching
subtopics people talk about in conjunction with your target topic
http://twitter.com/#search?q=TOPIC