The Info Panel is flying over Open, Save and Browse dialogs and lets you following:
See the full path to the folder opened in the file dialog. Clicking on this text opens the currently displayed folder in the Explorer or Windows Commander.
See the total size occupied by files in the currently displayed folder. Clicking with the mouse on this text will calculate file sizes in sub-folders.
See the amount of free space on the local drivers. Clicking on any drive switches the file dialog to that folder. This is extremely useful when you're going to extract a big zip archive to your hard drive.