The GIMP Page

The gimp-psp project is now split into the libpsp library and a GIMP plugin. Combined, these enable The GIMP to access Paint Shop Pro image files. At the moment, only import is supported and it is not decided yet whether LZ77 compression will be supported someday. Paint Shop Pro is a product by Jasc Software, Inc.
GUG - The Gimp User Group. Join the list by sending email to gug-subscribe@sunsite.auc.dk or meet some members of the GUG in irc: IRCnet channel #gimp (my nickname is MrXEye).
The GIMP Homepage.
The GIMP User FAQ
Writing a Gimp Plugin - a short but useful guide for the plugin developer.