If you want your software tested and usefull feedback - error reporting tool
style - you want it to run on as many machines as possible; it is your
interest to be so!
Now, you have corporate/business machines which are pretty much standard: on
board most anything (video, sound), 1x60+ IDE HDD, LAN... etc. You can ask
Dell to test it since the user on a corporate network is pretty much
restricted to use whatever the sys adm allows.
You have left the private/home users which have a variety of soft/hard
setups (multiple OS's, home networks, multiple storage arrays etc); this is
where you want to test if you release a public beta. Since you need as many
error reports as possible <g>, you make sure at least most common hardware
(audigy, nvidia, ati, intel raid etc) gets some support - nvidia already has
Vista Beta drivers, for ex.
This is where Vista Beta lacks preparation from the Vista team... makes it
look more like a PR stunt aimed at convincing stock holders that Vista is
almost there.
Michael