I've tried to implement this plugin on my WordPress 3.0.4 installation. The links are still shown, but the titles are not trimmed as I put in the parameters:
<?php my_prev_post_link('%link', '« %title',false,'',30,'') ?><?php my_next_post_link('%link', '» %title',false,'',30,'') ?>
A shame, as it's the only possible solution I've found so far that would allow me to shorten the titles (to make both previous and next post links fit on a single line).
Anybody have a suggestion? Or perhaps I'm not using the parameters properly?