As many replies have noted, iinet does have many ADSL customers using Mac's
(including this family on an ADSL "freedom" plan - which provides a fixed IP
address) and set up was very easy, despite the lack of tech support. The
main problem with this contract (now not available) was that for most family
members, it was effectively a 1 GB at $79.95 per month plan rather than the
advertised 3 GB/month, because 2 GB were only available between 12 midnight
and 7 am seven days per week. In relation to mac support, note this comment
in the most recent version of their service contract:

8.4.8 iiNet supplied modems are not supported under the following
circumstances:


(i) You running internal modem software other than that provided with the
modem; (ii) You running internal networks on our internal modem software;
or (iii) Macintosh Operating systems below 10.0.

Maybe this clause is why some tech's think mac's are unsupported. The new
Bliink contract has connection speed penalties rather than financial
penalties for exceeding the contracted volume each month. Its main
attraction is that the contracted volume is available at any time (no peak
period concept).
Unlike other responders, I haven't noticed any conditions in their online
advertising or contracts saying that downloads between midnight and 7 am do
not count towards the contracted monthly volume. The following conditions
might impact upon users thinking of setting up a home-based web server (port
80 blocked):

8.4.23 The download speed of Bliink and Biz-Bliink Plus are subject to
shaping. Shaping means the download speed from the Internet will be slowed
after the specified Traffic shaping level has been reached in a calendar
month. The download speed will be slowed to speeds similar to 64kbps for
Biz-Bliink Accounts, and 56kbps for Bliink Accounts.

8.4.24 The instigation of shaping will cause You to lose Your Internet
connectivity, and You will need to reboot Your modem and computer.

8.4.25 Bliink Home Accounts are dynamic IP Accounts. A new IP will be
assigned whenever the computer and modem is rebooted. The IP remains until
the next time the computer and modem is switched off. IP¹s can only be
reallocated on new connections and iiNet is not liable for any data
intrusions while You maintain an active session. iiNet recommends You
routinely reboot Your modem and computer.

8.4.26 The Bliink home accounts are not suitable for hosting externally
accessible servers and the following ports are blocked for incoming
connections: Port 80 (WWW), Port 25 (SMTP), Port 139 (NetBEUI and IPX/SPX),
Port 443 (HTTPS) and Port 0. Other ports may be blocked without notice if
this is deemed necessary for security or network management reasons.

For those looking to save money, note that iiNet's hardware prices for
modems (eg Dlink 300), combined modem/routers (Dlink 504) or filters needed
on each wall outlet for use with other telephone equipment have a
significant premium (40 - 80%), compared to that from other computer
peripheral retailers. I would recommend a dedicated router (such as a
combined modem/router - to reduce clutter - or Airport attached to modem)
for sharing the internet connection over a software router. If like me, you
have a need to boot between OS 9 and OS X on a frequent basis, you won't be
disrupting the connection to other users.

Richard.