Thanks for the feedback everyone.

I've changed the typeface now, however you may have to hit refresh on your browser because I've used some pretty aggressive cache-control headers.

It's not a hugely massive change in typeface style because I really can't stand sherif when reading large chunks of text however I have also included some tweaks in the spacing which might also help.

Let me know if that has improved things or if I need a more dramatic change in typeface.