Count 'em Ten

Ten Word Count Widgets for NaNoWriMo

AllIndieWriters.com's Wordcount Tracker

Another Little Progress Meter

Critique Circle's Word Meter Builder

Language is a Virus's simple NaNoWriMo Word Meter

NaNoWriMo's page of official participant wordcount meters

ProgPress is a word meter plug-in for the WordPress (hasn't been updated in a while, so caveat emptor)

StoryToolz's word count meters page (must register to gain access but it's free)

Writeometer, which I think is an Android App

Writertopia's two wordcount meters

Writing Journal, which is a free iTunes time tracker & word meter