The Drive Cleanup Wizard helps you get rid of useless, unwanted, temporary files from your machine. You can specify custom file-types you want to search and destroy. Works across User Profiles on a machine. Handy tool for System Administrators.
The Image Resizer allows you to resize/scale multiple images by percentage or by a fixed width/height. You can also apply a greyscale filter on-the-fly to scaled images. Drag and Drop enabled. Sports an extremely easy GUI interface.
If you need a tool to convert a 100 odd files that are in various different formats into one format, Image Convert is what you need. Supports JPG, GIF, PNG, BMP, WMF, EMF and TIF formats.