I solve bounce with a sledgehammer ...
... my 'wait for a contact to close' function looks like this;

        - delay for 100ms
        - wait for contact to open
        - delay for 100ms
        - wait for contact to close

This gives me immediate response to a contact closure, and tends to
ignore any bounce.  Of course, any induced noise may trigger it, but
that's not a bounce in my books.  I fix noise in other ways.

--
James Cameron                              (james.cameron@digital.com)
Digital Equipment Corporation (Australia) Pty. Ltd. A.C.N. 000 446 800