Yes, it is done. What I meant by that statement was "In the grand scheme of the things, the overall importance to a user of program defragging is..."

That's because, once a program is installed on a clean disk (or on a defragged disk), the data bits that make it up will will tend to never move again. Unless a defrag utility sees that it is used often, then the algorithm will kcik in to move it. XP/Vista takes care of this automatically. Others will do it, too. Program updates to it could also frag it unless your disk is defragged, with lots of contiguous free space.

We work with (develop) high availability index and querying edgeware (software) that can write/update/delete gigs of data at a time. We've done multiple tests on defragging both single disks and RAID'ed sets for before/after MFT file sizes and their fragged extents, query times and contiguous free space before/after.

Defragging works -- that's why DiskKeeper (and others) are still in business. And that's why I use jkdefrag for personal use.