I use this site for other things, but for digging up old bits of information via old websites, go to:
http://www.archive.org
This is an archive of the internet if you will - a backup of old sites. Since most companies redesign their websites on a regular basis, some of the information regarding older pens are often lost.
This site allows you to browse back in history - an internet time machine if you will.
I find this site very useful and thought I might share it. Apologies if this has been posted before.