best 2 harassment was a farseer and a blademaster
Blademaster uses windwalk, and focus on one peasent/peon/aco/wisp. if he runs into trobule , he windwalks again, and does extra damage,(usualy killin that worker)
Farseer uses spiritwolves, the wolves plus the FS together usualy attack one unit, and they do good damage together. FS harass was nerfed majorly for patch, that u wont be seeing it much