http://steamreview.org/external/blender/BlendThumb.zip
Blender 2.5 embeds a 128x128 thumbnail in .blend files, one per active camera. This thumbnail handler for Windows 7 and Vista extracts the first one. Follow the instructions in the readme to install! 
(This will be make it into Blender at some point, I’m told.)
Wow! I’ve been looking for something like this for awhile. It works great on my Win 7 64 machine. Thanks so much!
Nice work , thanks
I just released an update. This version scales the image down nicely. Same URL: http://steamreview.org/external/blender/BlendThumb.zip
this should ship with blender.
Could you release an installer for this?
Yes, it will ship at some point.
(I’m not going to bother with an installer which only performs one command!)