Auslogics Disk Defrag

The current version (3.1.10.165 - 12/14/2010) works without problems I have mentioned before.

Very fast and easy to use. I particularly like the graphical interface that shows you the fragments unlike Vista's defrag tool. You can really notice the speed increase afterwards.

Tired of bloated, sluggish software, then this software is for you. It's really fast.

Combining the Windows 98 type defrag UI, and settings that make sense, and can allow you to defrag the files that need it in under a minute at times. Defraggler is the only defragging tool in the same league.

I think with Windows 7 you do not need a special defragmentation program:
One of the aspects that has evolved in Windows 7, compared with Windows Vista, involves the operating system's capabilities to glue back together disparate fragments of files that have become fragmented as a natural consequence of hard disk use. “The defragmentation engine and experience in Windows 7 has been revamped based on continuous and holistic analysis of impact on system responsiveness,” Rajeev Nagar and Matt Garson, both program managers on the Windows 7 File System feature team, revealed.
(1) http://news.softpedia.com/news/Windows-7-Defragmentation-Engine-the-Evolution-102941.shtml
(2) http://bit.ly/7EInfk
(3) http://alternativeto.net/desktop/windows-7/

This tool is quite similar to Piriform Defraggler, as it can defragment selected files only.
The details i liked about Auslogics Disk Defrag were however:
- drive map color legend directly in the main window (green color for continuous files)
- multiple volumes can be selected defrag + chkdsk (native OS cmd window is shown, thus also minor errors will be shown)
- portable version: only one exe file instead of a ZIP

Cons:
- does not show files of each block
- only free for home use

The tool is nice but unfortunately, I've got file system problems with my Windows XP using this tool. They were not so serious, but it is not so easy to fix, especially for inexperienced user.
Verdict: I don’t recommend.