riding sail - 1 vote for
should perhaps have put this under product reviews, but will leave it here instead for reference.
my 32 foot jeanneau sails at anchor moderately - not as much as the only other two boats i've anchored on overnight, but enough to be annoying.
bought a riding sail from sailrite and recently tried it out at anchor and what a difference! very effective. tested by taking it down and putting it back up a few times to do a side by side comparison. we really liked it, my wife even more so than me (sailing at anchor always interupted her sleep for some reason). i had read that there was a noise issue, but we didnt hear anything.
also only takes a few minutes to put up and take down.
i've read that the FinnDelta is better but for simplicity and cost we're pretty happy.