The idea
Classic typing tutors make you type 'the quick brown fox' 200 times. TypeTutor Pro pulls in content from your RSS feeds, saved articles, or Kindle highlights, and builds typing exercises from text you actually want to read. Your WPM goes up because you're engaged, not bored.
Features: adaptive difficulty (longer words as you improve), accuracy heat map by finger, custom content import, streak tracking. I've been prototyping this for 2 months — it works and it's genuinely more fun than Keybr.