Here's is a Mollom spam filter plugin for Laconica.
To enable, download MollomPlugin.php
Place this in the
plugins "local" folder of your laconica installation
Add the following to your config.php
$config['mollom']['public_key'] = '...';
$config['mollom']['private_key'] = ..
$config['mollom']['servers'] = array('http://126.96.36.199', 'http://188.8.131.52');
replace '...' with your own public and private keys for your site, which you can get from mollom.com
If you're using this plugin, i'd love to know about it -- email@example.com or shiny on freenode.
Note: it doesn't currenly save which servers are active on the mollom service - this coming very soon.