Here are a couple of links to other pen sites that are informative or provide services.

Inkpen Joel Hamilton and Sherrell Tyree's website.  They offer fantastic repairs and pens for sale.  Joel's the Vac man and specializes in Parkers, and Sherrell handles the Sheaffer's.  If you need a repair, they're the place to go to!

www.vintagepens.com David Nishimura's website with great pen profiles and a huge vintage pen catalog.

PCA Pen Collectors of America Website.  I highly recommend becoming a member if not already one.  Great information available in the Pennant as well as a plethora of information available from the PCA library.