Blog Import script. serendipity 0.8 to Wordpress 2.9.2

I need a script to import users, categories, posts, accepted comments and timestamps from serendipity 0.8 (s9y) to a new Wordpress 2.9.2 blog which is already installed. I have tried using scripts found via search engines but they failed, probably due to the changes to WP structure since 2008 (see: [login to view URL] for the most upto date script I found - it may help save some time?).