Hi
Are you installing your server as "server-only" or "server-gateway" mode ?
Your modem IP is 192.168.1.1 , so this should be your default gateway to connect internet.
If your setup is server-gateway, and 192.168.0.1 is your LAN address, so it seems correct. Otherwise.... I just cannot understand your setup.
How your server + local machines are connected? Using a hub/switch I presume. So you should have this setup:
Internet--------- ADSL modem --------------- SME SERVER (server-gateway mode) ----------------- SWITCH --------------- Local machines
valid IP 192.168.1.1 192.168.1.154 192.168.0.1 192.168.0.X (x>10)
To have yuor site visible from internet, you must forward port 80 from ADSL modem to SME Server.
Ask if you need more help: I can be reached at gmail as jader.marasca (and we can use chat in gtalk). I´m in Brasil (GMT-0300)
Good luck
Jáder