Here too, except fax, pbx but more mail, antivirus, printservices. 128 MB Ram on PIII 1000, notorioulsy few RAM, but good uptimes and less than 3% load.
The only thing i'm worrying is: i should really really outsource the firewall to a seperate firewall-only machine. The more services running onto the same box, the more risky it gets. For home use seperating services is, by all means, oversized. So go.