There's a lot of controversy regarding whether or not you need to watch keyword density. If you're in the camp that you do, I personally like SEO Book's Keyword Density Checker.
Personally, I look at keyword density only for very specific situations. Do read the description before putting much emphasis in keyword density.

We do extensive SEO for a number of automobile dealerships nationally. Keyword Density, without a doubt, is a contributing piece to the overall SEO puzzle. I've noticed a nice increase in the SERPs with as little as a 1% adjustment to the Keyword Density on a particular page.
Posted by: Dan Mercurio | October 17, 2007 at 09:20 AM
Hi Jessica
Is there a pc based density checker that you are aware of so we do not need to load content into a website first.
Posted by: Goran Giertz | March 13, 2008 at 05:57 PM