FragExt

mutexed.com - FragExt

"FragExt is a free application and shell extension set, designed to
help you manage file fragmentation on FAT, FAT32 and NTFS volumes.

The set includes

• A unique file defragmenter which allows you to defragment specific files
  rather than an entire volume.
  
• Windows Explorer column and info-tip extensions for displaying file
  fragments, extents, clusters, disk space usage and alternate data streams.
  
• A file property extension for displaying detailed information about a
  file's, folder's and NTFS data stream's fragmentation information.
  
• Integration extensions for simplifying the use of the FragExt defragmenter,
  allowing you to select and defragment files directly from within Windows
  Explorer.
  
• Simple reporting features allowing you to save the information FragExt
  gathers.
  
• A scriptable defragmentation engine, allowing you to create your own custom
  utilities.

..."

This sounds like a very cool and useful free utility...
Check out the site for more details, screenshots, etc. And guess what? It comes
with the source.  : )

While you're there, check out some of the other stuff on http://www.mutexed.com/. There are some
pretty cool photo's and other stuff...

(via SHELL EXTENSION CITY)