I am somewhat left handed. I cannot write at all with my left hand, as I do not seem to have fine control for writing or drawing with it. However, I throw left handed as I have good control and power, but I punch right handed as I do not have control or power to punch with my left hand (different muscle groups I guess). As far as all other mundane tasks (such as eating), I use either hand interchangeably.
Oh yeah, I throw left handed, but bat right handed, but golf left handed, and bowl right handed