Scribd in HTML
I applaud their effort, but when I look at real documents in both formats (e.g. http://www.scribd.com/documents/5/Paper-5 like ZeroGravitas posted here), the HTML5 version looks very noticeably worse than Flash (tested in Chrome 5, Safari 4, FF 3.6).  Fonts are rough or missing, kerning is shot to hell, and layout looks like it was performed on a shake table.  It resembles the output of a poor PDF viewer.I wonder if this was the right time to roll out the HTML5 format.