...Somewhere in Andrew's house is a hefty Linux server running many applications, including an Asterisk Open Source VoIP software PBX. There is no desktop PC in Andrew's house. Instead, he runs a Linux thin client on a Sharp Zaurus SL-6000 Linux PDA. Sitting in its cradle on Andrew's desk at home, the Zaurus (running a special copy of Debian Linux, NOT as shipped by Sharp) connects to a full-size keyboard and VGA display, and runs applications on the server. Another cradle, monitor and keyboard are at Andrew's office, where he also doesn't have a PC. Walking around in his house, the Zaurus (equipped with a tri-mode communications card) is a WiFi VoIP phone running through the Asterisk PBX and connecting to the Vonage VoIP network. Walking out of his house, the Zaurus automatically converts to the local mobile phone carrier, though with a data connection that still runs back through Vonage. At Starbucks, it's a Wifi Vonage phone. At Andrew's office, it is a WiFi extension to the office Asterisk PBX AND to Andrew's home PBX. That's one PDA doing the job of two desktop PCs, a notebook PC, and three telephones.