Defraggler - a new kind of disk defragger

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!

Its currently in beta and I would recommend waiting for an official release before trying it. Something about a beta disk defragger that makes me nervous.

Link:
http://www.defraggler.com/