I work almost exclusively in Finder's List View, which has an annoying folder creation "feature" that I dislike. Once you've used the Right Arrow to drill down into a few subfolders, when you hit Command-Shift-N to create a new folder, that folder will be created at the root folder of the Finder's current view, instead of in the folder you're looking at.
What I wanted to do was select any folder, press a keyboard combo, and have a new folder created inside that currently-selected folder. Similarly, selecting a file and hitting a shortcut would create a new folder where that file is located. So I set to work with AppleScript; here's the code
Mac OS X Hints
http://hints.macworld.com/article.php?story=20081119025327978