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.

Richard Binder's Website  Home of some really great info on the various pen companies as well as custom ground nibs.

Bill Acker's Page Bill has some great information on Esties on his site including some harder to find $1.50 pens and V-clip models.

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.

Pendemonium Sam and Frank Fiorella's site with lots of supplies, books, and of course, pens for sale.

David Isaacson's Page THE Vac meister himself.  David has forgotten more about vacumatics than most people know.

Pentrace Great site for info on pens and an awesome message board as well as pen market.