Port update advice

[Graham Bentley]

Hi All,

Following a Portsnap Fetch / Extract on top of
a base install what is the best strategy for keeping
ports updated?

I think maybe it would be a waste of time / bandwidth
to fetch the entire ports again or on a weekly basis so
am guessing here that I should be checking to see
which ports I have installed that have updates?

What is the best method / tool to use in this case?

Thanks in advance :)