North American Fruit Explorers mailing list at ibiblio

["Kieran and/or Donna" <holycow@frontiernet.net>]

Yellow guavas, yuck.  However the red ones are nice, and a bit more cold 
hardy if I remember correctly.  You ought to be able to find some guava 
jelly to get an idea of the flavor.  Popular in some tropical countries. 
Donna