While certainly a dynamic and sensitive spoken communication style in the classroom is key, to often I see instructors underestimate teh importance of there written communication skills. Whether in lecture slides, assignment sheets, syllabi or email's, they let shoddy grammar, spelling an punctuation slide. While its often lamented that today's young students lack the ability to rite in proper english, certain errors scream out, and at least one student will always catch them, even if they don't always point them out. At tat point, the instructor looses credibility and the weight of authority in correcting similar mistakes in the students' work. Like in the above two paragraphs, where I intentionally left multiple word-usage errors, misspellings, misplaced apostrophes, and ironically failed to capitalize "english" (and yes, the typo in the subject line was intentional, placed there as bait). Hurts to look at, don't it?