Heytools - JavaScript tools, AJAX tools and some fully server side tools.
Spritz Bookmarklet - Speed-read on any website
WordCounter.net - Count words, sentences, paragraphs etc.
Reading Time - Tells you how long an article takes to read
Word Count Tools - The must-have free word counter that provides an extensive report about the word count, character count, keyword density, readability & many other useful stats.
How Long to Read - Find out how long will it take you to read that book