PrintFolder, as Steve suggests, is what I use for infrequent / ad-hoc info-to-clipboard tasks.
If it's something you need to do often then it might be worth creating a one-click button to do it. My Copy IMG links to Clipboard with Width and Height button could be adapted to copy different details to the clipboard. (Shout if you want it but don't know VBScript. It won't take long to do.)
For single files, a handy hint is that you can push Ctrl-Shift-C while their tooltips are showing to copy the tooltip text to the clipboard. The tooltip contents can be configured for each file type so that can be a quick way to get file details, but only for one file at a time.