Alison Sparks,
I work with bereaved children.  I like to use the continuing bonds model by Klauss Silverman and Nickman.  Often we will do artwork around what characterstics have been passed on by their parent who has died.  It may be a portrait or an abstract collection of things.  Often very powerful and connecting.
Continuing bonds model by Klauss Silverman and Nickman

Marco MENESES,
My favorite tool is the Food Pyramid in Spanish:
http://www.usda.gov/cnpp/Pubs/Pyramid/La%20Guia.pdf

Akiko Sakaedani,
UNICEF(CEE/CIS region) has a site dedicated to Iodine deficiency
http://www.ceecis.org/

On its "communication" page there's link to various communication guidelines
http://www.ceecis.org/iodine/06_communication/06_00_mp.html

David Ruiz Londo,
The MARCH Model, www.cdc.gov/reproductivehealth/Global/MARCH.htm is my favorite

Onoriode Ezire,
Favorite Tool or Model: PSRHH PEP Model (Peer Education Plus). It combines PE activities with Advocacy activities to create enabling community environment, Participatory monitoring and evaluation, use of drama, making available: products, services and IEC materials