Libxml is already in use in a number of environments:
  - rpm2html/rpmfind: generation/maintenance/client for 300Megs of RDF
    encoded linux software package metadata
 
  - configuration files for programs, metadata (gconf, glade, nautilus)
 
  - data format for gnome programs (gill, gnumeric, gphoto, ...)
 
  - embedded system (TV desktop set)
 
  - handling of satellite images
 
However most users just don't give feedback, but patches are coming (and
usually accepted !)