A file defragmentation tool from Piriform, the company that brought you CCleaner and Recuva...

Defrag Individual Files
Most defragmentation tools only let you defrag the whole drive. Defraggler gives you the power to select individual files and folders to defrag. So you can get the job done in seconds, rather than waiting for the whole drive to complete. Of course if you want to defrag the whole drive Defraggler will let you do that too.

Compact and Portable