SequoiaView
If you need to do some clean-up on your disk, you should definitly download SequoiaView to get an idea where the big files are hiding. If offers a nice and efficient treemap view of your disks.
Update: As viewed on
Larkware, you can also try
SpaceMonger
and
Scanner.
Update:
FolderSizes
Update:
WinDirStat