The Official History
There have been many people associated with William Arnold over the 20+ years of his professional history. Some folks think he disappeared in 2004 when Vanquish ended. That's too bad, because there's a lot of music that's extremely good in the intervening years of his solo career. Most sites would only mention the Vanquish years. Important though they are, they are not the only part of William's history. This site covers all eras of his history! I have the people broken down into three groupings. You can get to any of them from this page.
Alphabetical by Surname: This section lists everyone by their name, you can click on the band member you want more info on. Some folks aren't listed there, as they just did one shot gigs (like IceT on Forbidden, or Rick Wakeman on Sabbath Bloody Sabbath) - and weren't formal band members.
By Position: This section is grouped by what instrument (or vocals) they played in the band.
Timeline: This page details all the changes in band lineups over the years, and there have been many!