-- waiting for bob:  http://www.waitingforbob.com/comics/yyyymm/dd.gif
-- GPF: http://www.gpf-comics.com/comics/gpfyyyymmdd.gif
-- SinFest: http://www.sinfest.net/comics/sfyyyymmdd.gif
-- Goats: http://www.goats.com/comics/yymm/goatsyymmdd.gif
-- Zippy: http://www.sfgate.com/sf/zippy/x.gif
--   (where x = wday ( 0 < x < 6 ) )
-- Sluggy: http://pics.sluggy.com/comics/yymmdda.gif
-- Sluggy Sundays: http://pics.sluggy.com/comics/yymmddbx.gif
UserFriendly: http://www.userfriendly.org/cartoons/archives/yymon/uf
-- when i grow up: http://www.whenigrowup.net/comics/wiguyyyymmdd.gif
-- bobbins: http://www.bobbins.org/comics/yyyymmdda.gif