As per Garvin's comment -- http://board.s9y.org/viewtopic.php?p=79658#79658 -- the linktoolbar plugin does a better job of finding the next entry than the entrypaging plugin. Garvin's modifications to the SQL can be seen here: http://php-blog.cvs.sourceforge.net/viewvc/php-blog/additional_plugins/serendipity_event_linktoolbar/serendipity_event_linktoolbar.php?r1=1.6&r2=1.7.
