I recently found the excellent freewaregenius website, and a
review of Xentient thumbnails, which I found to be a very useful tool for Windows.
It helps seeing miniature thumbs of your images instead of generic icons for each filetype, however in a lot of cases those thumbnails will still be too small to be helpful (especially with list or detailed view), and hence I would like to see:
A little addon for Explorer which will extend the standard tooltip functionality to include a proper thumbnail of the image hovered. A key to the success of such an addon is of course speed, if it is not fast people might as well open a 3rd party image browser... my thing is that although I know a bunch of those tools exist, I like to use Explorer, and would really prefer to see such a function added to Explorer rather than having to turn to another 3rd party application.
I also tried to come up with a name, but got nothing other than "PicPop"