Nowadays, bloggers are getting more and more, so blogging sites also increase dramatically. When you do a search for something popular on the internet, you will see hundreds to thousands of results, this is called information overload, and people will need to narrow down their searching choice of topic/niche in order to find for the information they are interested in.
For that reason, it is important to do some niche and keyword research if your niche is not receiving any searches then the chances of people finding your blog. Hopefully, these tools can help you to decide which of your ideas are popular niches and actually receiving good rank of searches in the Search Engines.

Tools to help you decide on popular niches:
1. Google zeitgeist

2. Yahoo Buzz

3. Twitter Advanced Search

4. eBay Pulse

Tools to help you for keyword research:
5. Google Keyword Tool

6. Free Word Tracker

7. Free Keyword Discovery

8. Good Keywords (Software)