there are a few scripts on hotscripts.com which do make thumbnails. not as well as photoshop but still not so bad.
i think it\'s bether to create and save and \'action\' for creating thumbnails in photoshop (of course, if you have it), and than just run it. photoshop can make up to 100 thumbnails in a minute if you have a faster machine. and these thumbnails are bether than \'php-thumbnails\'
i have made a script index.php that you have just to put in dir and run it. it is taking thumbz from a dir called \'thumbz\' and the big pictures from a dir \'big\', there are \'previous\' and \'next\' buttons. nothing else. very simple, working, 3 kb, but you have to create thumbz by yourself.