Liking Folder Menu a lot. It’s a small, configurable app which allows you to switch to commonly-used folders in various apps. You can pop a list of folders up with the middle mouse button (for example) in a standard Windows file selection dialog. Choosing a folder will immediately change the file selector to show the contents of that folder. You can also ask the program to monitor other apps (eg Windows Explorer), or even the desktop. Using the latter functionality, you can choose a folder from the popup and you’ll instantly get an Explorer instance opening to that location. In practice it’s extremely handy for plenty of tasks which require you to browse different locations on your hard drive – saving files from a website, editing documents and plenty more.
The program also allows you to activate certain other functionality from within its popup. A nice touch, which unfortunately increases the time-to-appear by a second or so, is a "drive" menu which will show you the current free space on all your drives. You can also quickly perform tasks such as viewing recent files, restarting your PC, running miscellaneous programs or even visiting a particular website.
Completely free, x86 and x64 versions available. It has now replaced DirectFolders permanently on my system.