Since I write paid posts on a couple of my blogs, I like being able to count the number of words in my posts. If I have to write a minimum of 200 words, I need to know when I get to 200 words. I usually end up rambling on and writing more, but that's beside the point.
I did have a tool in Firefox that counted the words for me, but since I installed Firefox 3, I haven't been able to use it. Probably I should look for a new extension that will do it for me, but until then, this Word Count Tool works really well. Just paste the post into the box and hit 'Submit' to find out how many words you have. It also explains what is counted and what isn't, and it's free.
