As of this writing, the tool is found at the URL: WiFi.Google.com/download.html.
A FAQ file at the site describes the Windows-only software as ''a downloadable client application that allows users to establish a more secure WiFi connection.'' It connects to a Google virtual private network (VPN) server in order to secure connections for end users. This offering puts the company in competition with other software being offered by well-funded companies like JiWire and smaller parties like HotSpotVPN. Unlike the competition, Google will offer Secure Access for free.
The software is, obviously, still in beta -- just like most other Google services, including popular offerings like Gmail.
The FAQ says it is ''only available in certain locations in the San Francisco Bay Area'', where Google sponsors hotspots with partner Feeva. However, a download and run of the software here at Wi-Fi Planet seemed to create an (admittedly untested) secure connection without problem.