Another one: "ray racer" is probably meant to be "ray tracer" (that, or my imagination is far too small) - and links to another broken page here http://blog.johnnovak.net/tags/ray%20tracing

Thanks, good catch! No matter how many times I proofread my writings, some of these errors always slip through...

Also a couple of typos: "acceleation" and "sofware’s"

Cheers, corrected!