I have posted a new article on my website, that talks about many of the common problems of turning pens from wood. I hope it will be useful. Photos and cross-links will be added later. The link to the article is below:
http://www.woodturner-russ.com/PenPages-BetterPen-1.html
http://www.woodturner-russ.com/PenPages-BetterPen-1.html