How do I flip a bit in SQL Server?

Lacking on MSDN? http://msdn.microsoft.com/en-us/library/ms173468(SQL.90).aspx

~: Performs a bitwise logical NOT operation on an integer value. The ~ bitwise operator performs a bitwise logical NOT for the expression, taking each bit in turn. If expression has a value of 0, the bits in the result set are set to 1; otherwise, the bit in the result is cleared to a value of 0. In other words, ones are changed to zeros and zeros are changed to ones.

Bitwise NOT: ~

Bitwise AND: &

Bitwise OR: |

Bitwise XOR: ^

Yes, the ~ operator will work.

update foo
set Sync = ~@IsNew