Deadlock

Is there some kind of log, table or something that I could get more
information about a deadlock situation that is occurring in my database? I
just get a transaction number and a process id, which is useless to me
because my application terminates on any errors from the database? It occurs
infrequently (about once a day) and I have no idea how to track it down.
Also sometimes the database just freezes (RedHat EL 3.0 Postgresql 8.0.1)
could this be a deadlock situation? There is nothing in the log about
deadlock or anything else when it freezes (this happens about once every
month or so)

Thanks,
Bart