I just heard from ESRI's ArcPad marketing team, apparently a server issue may have prevented some people from accessing the free trial download.. the problem has now been rectified. From ESRI... we experienced a server issue on esri.com when we uploaded the 7.1 download files yesterday. This was resolved within an hour or so and all files should be ready to download now. Please try again and my apologies for the inconvenience. See more in the announcement or jump directly to www.esri.com/arcpad.