1. Apparatus for controlling wireless internet access comprising: an access point configured to communicate with a mobile device and to receive a connection request from said mobile device; a walled garden server; an access controller comprising one or more digital processors, computers or microprocessors and configured to communicate with the access point and to communicate over the internet with the walled garden server; wherein the access controller is configured to respond to a connection request from the mobile device by sending a response to the mobile device indicating that the access controller can serve content from the walled garden server to the mobile device, such content comprising selected free content and selected non-free content; wherein the walled garden server is configured to provide one or more free access links to the mobile device to one or more internet sites to which internet access is controlled through use of: a URL seed database indicating which of a plurality of URL's may form the start of a browsing experience by a user of the mobile device on said one or more internet sites as to which a free access link or links have been provided; a URL denied database comprising URL's which the mobile device may not traverse while browsing; a specific URL database comprising a list of specific URL's to which the mobile device has previously been granted access; and a specific depth database storing a plurality of seed URL's and a maximum depth parameter associated with each seed URL, each maximum depth parameter indicating a maximum depth to which a user of the mobile device is permitted to follow links on a selected seed URL; an affiliation database comprising a list of one or more internet sites with which an operator of the walled garden server has an arrangement to derive affiliate revenue; the access controller further comprising a software implemented traffic tagger controlled by said operator and configured to tag a request for access to said one or more internet sites as coming from the mobile device, thereby enabling a sponsor site to track revenues derived through use of a said free access link by the mobile device; and wherein the URL seed database, the URL denied database, the specific URL database, the specific depth database and the affiliation database each comprise a computer readable storage medium or media.