BLOOMINGTON, Ill. - R. Craig Hogan, a former university professor who heads an online school for business writing here, received an anguished e-mail message recently from a prospective student. "i need help," said the message, which was devoid of punctuation. "i am writing a essay on writing i work for this company and my boss want me to help improve the workers writing skills can yall help me with some information thank you". Hundreds of inquiries from managers and executives seeking to improve their own or their workers' writing pop into Dr. Hogan's computer in-basket each month, he says, describing...