Maybe everyone else knows about Wordle, but I just found it and I love it! You can enter text, copy text, or copy a URL (web address) of a favorite blog. Wordle will then arrange your words in random order. Words that you use more often appear larger, and words you use less frequently appear much smaller. You can change the font and color scheme as well as the direction of the text. Here's a sample from my blog:
Here is John's blog: Every Daddy's Princess
It's a good way to see what you are talking about a lot!