No developers (that I'm aware of) have posted here, so I'm going to give my input. If somebody is willing to create some code that outputs a bitmap from a pms file, I'll give a shot at implementing a Windows Explorer shell extension for thumbnails. Nothing soon, since I'm on vacation and many a mile from my home pc.
Further information on generating thumbnails can be found in
this article.
[edit]
Way off topic, but meriting a casual edit... cooz, I find your signature laughably hypocritical. I'm not sure if you had meant it to be so.