The WPM Calculator by Kudit works great. It will be interesting to test this on the iPhone, and see how quick I can type on it, both when I get started and then a week into it...

Another good one by Kudit, this app works well and looks good.

<a href="http://www.kudit.com/applications/wordsperminute" title="Words Per Minute by Kudit for iPhone" target="_blank"><img src="http://www.modmyi.com/images/apps/wpm.png" title="Words Per Minute by Kudit for iPhone" alt="Words Per Minute by Kudit for iPhone" border="0" height="359" width="318" /></a>

<a href="http://www.kudit.com/applications/wordsperminute" title="Words Per Minute by Kudit for iPhone" target="_blank">http://www.kudit.com/applications/wordsperminute</a>