The following is a list of some useful pen links.
David Moak - Mabie Todd
David Nishimura's Vintage Pens
Ernesto Soler - Parker 51
Jim Marshall - Antique Writing Items
Jonathan Donahaye - Vintage Conway Stewart
John Mottishaw - Nib Repairs
Lih-Tah Wong - Parker 75
Onoto Pen Company
Penhero
Penpractice
Pentrace
Richard Binder's Page
Rick Propas - PENguin
Stylophilesonline