How do I expose an Infopath form to an anonymous user?

I tried copying the URL that is displayed in the browser when I try to
fill in an Infopath form as an authenticated user to the external site
where anonymous users will visit (with a slight modification to the
base portion of the URL). When I do this, I am prompted to login. Is
this because the form library is not exposed to anonymous users? This
is the only thing I could come up with. When I remove the query string
from the URL, it works (without prompting me to login) but it complains
that the name of the form is invalid.

Related to this, does anyone know of any (comprehensive and detailed)
resources for Infopath forms and Sharepoint? I am not finding what I
need and I feel like I am going in circles now.