Resources especially for young writers:

• Stone Soup, a magazine by young writers and artists
• Speak Up Press, an online journal that publishes young writers' work
• Writing contests and an ezine at Amazing Kids
• Scholastic's resources and contests for young writers and their teachers

For teachers and librarians looking for authors (including me) for visits and events:
SCBWI's speaker directory

Information I've developed for newsletter articles and conference handouts:
(You'll need Adobe Acrobat Reader to open them.)

• Tips for receiving critiques
  
• Blogging basics for children's writers
• Blogging basics for all writers
• Perks and perils of self-publishing
• Writing from the subconscious
  
• The art of the ending
  
• Query resources and samples
  
• PNWA session: Alliance marketing
  
• PNWA session: Puberty is not enough: Writing MG & YA fiction

Develop thick skin like this fellow. Keep writing. Keep biting.