I'm a bit late on the uptake for this; just stumbled across the post. However here's a solution which is more efficient & neat than the selected answer, but should give the same functionality:
declare @t table (name nvarchar(16))
declare @b bit
insert @t select N'Simon Byorg' union select N'Roe Bott'
select @b = isnull((select top 1 1 from @t where name = N'Simon Byorg'),0)
select @b whenTrue
select @b = isnull((select top 1 1 from @t where name = N'Anne Droid'),0)
select @b whenFalse