My particular concern is in finding Polyglossia's author, Francois Charette, whose email address I could not find in Google. However, I think the issue is much more general.
If you encounter a bug in one of the packages you use, or something you believe is a bug, what are your options?

Copyright (C) 2010 by François Charette <firmicus ατ gmx δοτ net>. However, I think this is still a good question in general. – Matt B. Feb 10 '11 at 19:36