the meanings of the magnitude of the imaginary frequency?

Dear ccler,
 I want to know whether there is any meanings for the
 magnitude of the imaginary frequency at the transition
 state. It is well known that the more the stretching
 frequency of the zeolitec OH group, the stronger the
 O-H bond. Is it still suitable for the imaginary
 frequency ? Does it mean that the transition state
 which have higher imaginary frequency is more stable
 than that which have low imaginary frequency ?
 any information is welcome. thanks in advance.
 best regards