re logging, how does one cleanup the write ahead and other logs

There's the one question which was asked
recently of how does one limit logs, but
another question is how does one cleanup
the logs that accumulate in pg_xlog safely?

If I try to load a gig of data into postgres
with default logging I'll end up with gig+
of logs files in pg_xlog.  If I blindly
go in with postmaster down and delete all
of these files postgres complains mightily.

What's the recommended cron/scheduler script
to keep these files from overwhelming the
filesystem?

Thanks,
Heitzso