If you want to access the Internet in a way that doesn't reveal your physical location (much), buy access from Metricom. They sell Internet access via radios. A small part-15 (900Mhz) $500 radio modem

This seems to be one of these devices which use the celular phone network. In Germany they are also available ("Modacom") and use the D1/D2/E-Plus networks. These networks can localize a sender in many cases with a precision of about 20-40 meters. Not the best way to keep the physical location secret... Hadmut