Bimmerfest.com (numerous 5, 6, 7 series owners and a fairly active E90 board)
Bimmerforums.com (probably the largest/most active, overall - most popular with E30 and E36 owners; also has an active Z3 board)
E46Fanatics.com (E46 owners, obviously)
Plus the Roadfly boards.
No doubt E90Post has the largest/busiest E90-specific board.
Those are the larger ones that I know of.
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Avid collector of the very finest Deutscher Schrott
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