User-agent: Mediapartners-Google*
Disallow:

## User-agent: *
## Disallow:
##
## Supposedly this will allow all robots to crawl the
##  entire site.  Temptation is to disallow unlinked
##  directories/pages.  But experience shows that this
##  merely encourages crackers.  You know who.  Better
##  to leave tham all unnamed.
##