Here are some tools that will help you find relevant keywords for your topic. These are all run by search engines. I will add some more tools later.
Out of all I find overture’s and google’s tool to be the most useful. They are related to the 2 biggest search engines after all, google and yahoo!.
Google’s [...]

Here are some free high paying keyword lists I have found. If you are going to build sites for adsense they might come in handy. Keep in mind that it’s against Adsense TOS to build pages solely for the purpose of displaying adsense ads.
http://www.sorve.com/adsense.htm - A bit outdated in myt opinion.
http://www.googlest.com - You have to [...]

Feewordpress is a WordPress plug-in that serves as a news aggregator for your blog. It supports Atom and RSS currently.
What can you do with it? You instal it on your blog and find some RSS feeds that you want to use. You add the feeds in the control panel and then it will take [...]

Yahoo just launched it’s new feature for searching, it’s called Mindset. From their FAQ:
# What does this Mindset demo do?
It allows you to sort search results for your query into commercial or non-commercial (informational) results, based on whether you’re shopping or seeking information.
So you search for something and move the slider to choose how much [...]