Just some feedback, there's about a 1 second delay before the final text is rendered on initial load. This creates a slight jarring experience due to resizing, kinda analogous to the infamous @font-face FOUC/FOUT issue
Tested on latest versions of Chrome, Firefox and Safari.
"Roddick SURVIVES, Staving Off Retirement" vs "Roddick Survives, Staving Off RETIREMENT"
Really nice that it's automatically disabled when displayed on a small screen than viewport defined.
Full Disclosure: I have nothing to do with this product :)
I remember attempting something like this earlier (http://stackoverflow.com/questions/8421533/how-to-obtain-ctr...) but I am stoked by your approach.
Nice work. :-)