I too use the corner, the 7 yr olds respond well to it, and the taking away of the priveledges ( TV etc) The nearly 3 yr old is one massive tantrum some days, but a lot of the time its pure frustration, as she cant do what she wants, or communicate it!! I try to see the problem, explain to her to use her words, and if she is still screaming, I hold her and firmly say, "calm down" several times, until she's calm, then we discuss what was wrong. If she is just being naughty, she goes to the corner. My 10 month old, gets a firm "no" when doing something inappropriate ( like chewing a power cord) then I reinforce this, if he continues, I pick him up and move him away from the object,, but a lot of the time I find a few firm no's do the trick, and he goes off anyway.