G548 isn't Illegal in itself. It is currently available LEAGALLY to ADC Primier members in the Assets section, as are the Developer Tools of the same build. What's illegal is downloading said software packages from anywhere but Apple. Both are available as DMG packages, again, from Apple ADC - and are burnable with a new beta version of Disk Copy, which again, is available at ADC.
What you OUGHT to have said is that this really isn't the place to discuss ADC software development packages. Doing so borders on violation of ADC and Beta Seedling Site non-disclosure agreements Although, ADC members and non-members appear to have regularly used this as a duscussion forum all along. The appropriate forum is in ADC at Apple itself. Unfortunately, Apple often takes FOREVER (If at all) to respond to problems or questions. Support for installation issues, again, is available at ADC. So, often people use this as an alternate forum, which, incidently, is usually more forthcoming than that of Apple itself.
NOW, if he happens to have an ILICIT copy of the developer's preview, then he's just a moron, as you suggested (Grin).