Related to usually describes a permanent relationship, whether between people or ideas. The past participle by itself (related) functions like an adjective.
Relating to is used generally to denote a reference to something else.
A more confusing example of the terms can be taken as:
Do you have any information related to/relating to ice hockey?
Here, both of them appear to give the same meaning but they are still different in the following sense.
Do you have any information relating to ice hockey?
This would mean that you want information which is actually about ice-hockey.
Do you have any information related to ice hockey?
This would mean any information which may even vaguely be considered having a connection is considered.