just downloaded 2010.11 this morning and for some reason Dolphin is not showing previews for things like images. It's set to.
Been a while since i used dolphin but iirc well there's an option to preview only local files, you can also raise the filesize limit for previewed files.
I don't use KDE much myself, but I did find configure Dolphin and I did find the preview tab. It's set to not show local previews over 5MB and was set to 0MB for remote files. All I'm getting is a generic icon for for example jpgs with just a "?" in the middle. The files are much smaller than 5MB.
Oh well, I installed Thunar and can see previews in it.
How's that GTK-based, lightweight E-17 coming along?