Now I've build my Reprap, I've been playing with extruding PLA.  Having tried stabbing at a few random settings, I need to get a bit more methodical with the whole process.  Here are a series of links discussing various settings, and configuration steps.

• http://wiki.makerbot.com/configuring-skeinforge
• http://davedurant.wordpress.com/2010/10/18/configuring-skeinforge-the-4-or-5-big-settings/
• http://forums.reprap.org/read.php?1,65192,65649
• http://richrap.blogspot.com/2011/06/skeinforge-version-41.html
• http://www.mendel-parts.com/new_forum/phpBB3/viewtopic.php?f=37&t=256