http://www.defraggler.com/
Defraggler is a free file defragmentation tool made by the same people that brought us CCleaner.
''It differs from other defrag tools on the market, by enabling you to quickly and simply defrag the files you want to, without having to process the whole drive. Simply run it, select the file and defragment in seconds. No more struggling with the Windows defragmentation tool!''
I find this program useful as anything I download is saved to 'my downloads' on my HD and then the files moved to their respective folders when I have the time. The 'my downloads' folder gets fragmented a lot so being able to select this folder instead of the whole drive saves a lot of time. I use defraggler on a daily basis and think its great, so I thought i'd share it here...