Here's a few niche and keyword research tools you might like. If you find any more not listed here, then get in touch and I'll add them to this list.
Got all your eggs in one basket? Here's a guide to monetizing your site using methods other than AdSense.
These are the current most popular broad niches being researched by users of the Niche Laboratory.
Key: = riser, = faller, = non-mover, = new
View more data on the Insights page.