Portable i.Disk

i.Disk scans folder trees displaying the total space used by each directory in graphical view.

You can drill down into the directorys to understand the layout of space. And when you want to clean up your disk there are same handy tools there to help. The directory called '.' is the space used by files in the base directory you are scanning in.

Each entry in the list has a right click menu to:

Touch - sets the modified time on a set of files in the subdirectory and all it's children to the current time. You can specify multiple extensions by separating with space character, e.g.: *.gif *.png *.html

Delete Files - deletes some or all of the files in the subdirectory and all it's children. The directories are left intact. You can specify multiple extensions by separating with space character.

Delete Directory - deletes all of the files and directories in the subdirectory then removes the subdirectory as well.