There are so many SEO tools out there, it can be a bit overwhelming. So from time to time, I'll report on tools I've tried and recommend.
Here's one worth giving a try, especially if you blog: Wordtracker's SEO Blogger. SEO Blogger is a free Firefox plug-in. After you download it, you click the little 'w' icon in the bottom right corner of your browser window to launch SEO Blogger.
Using the tool, you enter a word that's relevant to your blog post--in this case, words like SEO, blogger, SEO tools, etc. are appropriate. Wordtracker searches its database to give you the search volume for each word. You can click to add any keywords or phrases it finds to a list. As you write, the tool will tell you how many times you've used your selected keywords, along with the percentage of times you've used the keywords compared to all words in your post.
You could even use this tool for other content you write aside from blogs. For example, if you're writing a press release, you might copy your press release text from Word and paste it into a new post window on your blog service (such as WordPress or TypePad).
Next time: Zemanta.