Network fileserver considerations?

[Keith]

Holly crap this was easy to use. I've spent a couple days messing
with Apache webdav and a few other webdav server programs and it was
killing me. This just worked, my Vista test machine connected with no
issues as well as my Ubuntu desktop.

My goal is to have a basic file server for a small group. Something
like a simple Samba server but for the Internet. For my Windows users
I need them to be able to mount the filesystem as a drive letter,
otherwise they get utterly confused. Everybody that will access it is
remote and mobile connecting from various locations.

Note:
* Vista /XP users need to install a Windows update then it works great
with PyWebDav and they can mount the share as a local drive:
http://www.microsoft.com/downloads/details.aspx?FamilyId=17C36612-632E-4C04-9382-987622ED1D64&displaylang=en
* Ubuntu worked out of the box as a client

Questions:
1) How safe/secure is PyWebDAV to use as a small fileserver? Any
other considerations or recommendations?

2) Can I share multiple folders? For example:
davserver -D /tmp /media/Documents /meda/TEST -n -J

3) Authentication: Can I authenticate based on PAM, passwd/shadow, or
something other than MySQL?