PS Hot Folders is pretty nice. Just to point out, though:
* It doesn't save folder/file histories on a per-application basis--only globally (actually, for some reason, the file history feature didn't work at all for me).
* It doesn't save favorite files/folders on a per-application basis--only globally.
* It adds just one button to Open/Save dialogs, and you access everything from there.
* It doesn't add other things to the dialogs, such as an easy indication of the current path, or drive buttons.
I'm emphatically not trying to be a jerk, putting down mouser's mentioned software. Just trying to save somone some trouble, since I had to install PS Hot Folders to find out that it's not right for me. Not everyone will care about the things I mentioned.
And on the other hand, there is no idiotic splash screen, and--GOSH!--you get a registration code as soon as you order (unlike, in both cases, XFilesDialog). And I can only imagine the license isn't as much of a thumb-up-the-ass.
The drag-and-drop configuration is really nice as well.