The real question, though, is whether you want to run compression with Apache (mod_deflate, for instance), which will compress everything compressible, or if you want to use the native compression capabilities of the language you’re working with. PHP has a rather effective gzip handler that you can use just by sticking the following code at the top of your javascript file and changing the extension to .php.

<?php
	ob_start ("ob_gzhandler");
	header("Content-type: text/javascript; charset: UTF-8");
	header("Cache-Control: must-revalidate");
	$offset = 60 * 60 ;
	$ExpStr = "Expires: " .
	gmdate("D, d M Y H:i:s",
	time()   $offset) . " GMT";
	header($ExpStr);
?>

UHARC is so interesting to me, because it was the archiver for a long time, especially in the warez scene. I still remember seeing Class rips that had to be unpacked and injected with sound files. Then, at some point, RAR became the de facto standard for compression in the “Scene,” even though its multimedia compression doesn’t particularly impress me. Blame the ready availability of the unrar DLL, and the limitations inherent to UHARC: once games got to be over 2GB in size, there were some problems, apparently.

As I said before, some formats like PAQ or RK were so ridiculous in their requirements as to be untenable for realistic desktop use. UHARC pushes the limits (especially decompression time), but I included it as a foil for WinRAR (UHARC being the first widespread compressor with a multimedia filter, iirc) and also because there are some nice GUIs for it now.