I think it is definately alright to run constant codes, I have done it alot in the past with like daemons listening on sockets and forking processes to handle clients. I tend to use something more like this :

while (1) {
 opendir (DIR, $watcheddir);

 @files=grep {!/^\./} readdir (DIR);

 closedir DIR;

 foreach $currentfile (@files) {
     &filecontents;
 }
}
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really no need to use the sleep. and GOTO's should be gone with QBASIC :). Something as simple as this, don't worry about CPU usage, I would be ammused to see if this even sparked a blip on the "top" radar. tradez