As started in This Thread. Discussion continues here.
My response to Hawaii Cruiser's question is that EMF concerns from CPU cases - with or without clear windows - is a non-issue.
The main source of the EMF scare is a flawed late-70s study I learned of just a few weeks back.
Link - Item 9, along with a lot of other interesting information. Neat site.
Further info on the subject, with lots of references, citings, etc. is Here.
In the design process of computers, any EMF blocking measures are to keep 1) The computer from interfering with other local devices and signals, and 2) to prevent external EMF from interfering with the computer. And I had no effect either way with my case windows.
There's a lot of info. at the above links to digest, and I've only just zipped through them briefly, but given that after near-30 years of studies - including more recent cell-phone studies - there's no direct causal link between EMF and cancers, or any other serious effects that I could see, I'm not going to add it to my list of Things That Worry Me.