this list is not complete until aces gold is numero uno.
They were a hole in the wall.
Not big at all outside of forum land.
Don't forget BetPanAm. They came around exactly at the same time as BetJamaica. There was much debate as to which was the better shop at that time. Pan Am was highly touted, made a pretty big splash and then was gone in the Panamanian sunset with the $.
Aces Gold was HUGE. What was a total Forum Book that closed and stiffed was BetCamelot. It was the BetIslands of it's day, a Book started by a long time, "trusted" poster that used his forum rep to steal thousands of dollars from players when his Book folded.
Another Popular at the time Book that stiffed was New Age Bets(NAB).
WSEX gotta be biggest no?
Back in the early aughts they were arguably the #1 book for a little bit. Still remember watching the 60 minutes of that Cohen guy talking about the legalities of how they were in Antigua, the WTO challenge and how he can't comeback to America. This was right when online gambling was starting to grow.
Granted they were nothing by the time they finally stiffed but they were 1 of the original big online books.