Every time someone tries to avoid the classic setup of Internet to router to machine setup that we all know about they complain about issues of reliability, speed and setup "hardness."
Let's stick with tried and true and stick a router between that modem and that Tiger.
A friend of mine has the following situation:
In the living room he has a stereo hooked up to a single Airport Express (the only wireless router in the house.) In the sunroom he has an iMac Core 2 Duo running the latest version of Tiger hooked up directly to a DSL modem. Itunes recognizes this Airport express and successfully streams music to it. WiFi devices connect to this network but won't connect to the internet even though internet sharing is activated under the iMac's system preferences.
Are there some tweaks in the settings that will make this work or does he absolutely need another Airport Express connected to the DSL modem?