Irony yet again, the problem is with the font-stack. I guess you have a version of Helvetica that's not that readable. Only of they followed their own advice and tested it.Though this articles is nothing great and sorta ironic on this site but if you still want to read it - use Readability: http://lab.arc90.com/experiments/readability/

This is how it looks: http://img98.imageshack.us/img98/8523/201012030938.png