This could be a subject for discussion.
Not only could a WYSIWYG text editor be useful for editiing and remotely updating a website. But with the advent of broadband and people starting to host their own sites. Couple this sort of functionality, where you can choose a file and edit it / delete it at your own command, with a audio / visual data stream, and you could technically be incontrol of your whole machine from elsewhere.
If you imagine a Windows explorer window, which has a selection of files, both plain text, html, MP3, video. The newer OS's (2K, XP) will give you a little preview of this, and you can play files directly from the explorer window too. so why can't this be possible over the net (subject to transient conditions of course). There would be no more need for transferring files via smaller storage mediums (floppys etc) the only concern would be the obvious security issues.
With the filesystem commands in place within PHP, if not correctly used or controlled can place a huge burden on security. Even a simple browse upwards through the directory tree and chdir back through a different one could pose a significant threat - but is the price of this outweighed by the benefits of "remote computing" Can you ever underestimate a hackers capability to break through an .htaccess / login script ?
Surely this is worth some thought... just imagine...