Yes, I did read that excerpt... I am not saying that razor blades haven't been found and I'm not saying that they won't injure when used as a weapon, what I am saying is that the passengers are going to fight to the finish THIS TIME (in otherwords; the terrorists are bringing a knife to a gun fight).
I realize that isn't the guist of your post...
Is testing by America's enemies, of our aviation security systems/operations underway ? Likely...
Is the blog/blogger a bearer of truth... ah... honestly, I don't know.
As Michelle Malkin herself points out in the story, she isn't claiming it to be definitively true but it's entirely plausible, has substantiated precedent and is sourced FAR better than many that have graced the front pages of the New York Times. She's merely putting the information out there and asking for corroboration, which is something that many other 'reporters' don't seem terribly interested in doing.
I only view it as something worth reading and considering. If I run across another well-sourced article debunking this one then I'll post it in this thread as well.