token replacement

It would be very useful, if we could do some token-replacement on the url (and maybe on the title too), so we can have an url dependent on the node shown.
That way, we could i.e. build a link to a view having an argument, and we pass the current node-id ...

replacing could be done by using the optional 'token' module, or some simple mapping like '%nid' -> node if, '%uid' -> user id, ...